diff --git a/console.yml b/console.yml
index 10a9693..ee17af7 100644
--- a/console.yml
+++ b/console.yml
@@ -13,6 +13,8 @@ Commands:
   - SilverLeague\Console\Command\Member\ChangeGroupsCommand
   - SilverLeague\Console\Command\Member\ChangePasswordCommand
   - SilverLeague\Console\Command\Member\CreateCommand
+  - SilverLeague\Console\Command\Member\LockCommand
+  - SilverLeague\Console\Command\Member\UnlockCommand
   - SilverLeague\Console\Command\Object\ChildrenCommand
   - SilverLeague\Console\Command\Object\DebugCommand
   - SilverLeague\Console\Command\Object\ExtensionsCommand
diff --git a/docs/en/README.md b/docs/en/README.md
index e856a3e..677ce37 100644
--- a/docs/en/README.md
+++ b/docs/en/README.md
@@ -26,6 +26,8 @@ This documentation section contains instructions and examples of the commands bu
 * [`member:change-groups`](commands/member-change-groups.md): Change a member's groups
 * [`member:change-password`](commands/member-change-password.md): Change a member's password
 * [`member:create`](commands/member-create.md): Create a new member, and optionally add them to groups
+* [`member:lock`](commands/member-lock.md): Lock a member
+* [`member:unlock`](commands/member-unlock.md): Unlock a member
 
 ### Object debugging
 
diff --git a/docs/en/commands/member-lock.md b/docs/en/commands/member-lock.md
new file mode 100644
index 0000000..7ba050f
--- /dev/null
+++ b/docs/en/commands/member-lock.md
@@ -0,0 +1,22 @@
+# Command: `member:lock`
+
+Locks a member for the duration of `Member.lock_out_delay_mins` minutes.
+
+## Usage
+
+```shell
+$ ssconsole member:lock [<email>]
+```
+
+## Options
+
+| Type | Name | Required | Description | Options | Default |
+| --- | --- | --- | --- | --- | --- |
+| Argument | `email` | Yes | The email address for the member | _string_ | Prompt |
+
+## Example
+
+```
+$ ssconsole member:lock my@user.com
+Member my@user.com locked for 15 mins.
+```
diff --git a/docs/en/commands/member-unlock.md b/docs/en/commands/member-unlock.md
new file mode 100644
index 0000000..086bca0
--- /dev/null
+++ b/docs/en/commands/member-unlock.md
@@ -0,0 +1,22 @@
+# Command: `member:unlock`
+
+Unlocks a member.
+
+## Usage
+
+```shell
+$ ssconsole member:unlock [<email>]
+```
+
+## Options
+
+| Type | Name | Required | Description | Options | Default |
+| --- | --- | --- | --- | --- | --- |
+| Argument | `email` | Yes | The email address for the member | _string_ | Prompt |
+
+## Example
+
+```
+$ ssconsole member:unlock my@user.com
+Member my@user.com unlocked.
+```
diff --git a/docs/en/installation.md b/docs/en/installation.md
index acfa63e..35c7492 100644
--- a/docs/en/installation.md
+++ b/docs/en/installation.md
@@ -7,7 +7,7 @@
 It is recommended to install this module globally with composer:
 
 ```shell
-composer global require silverleague/console
+composer global require silverleague/ssconsole
 ```
 
 Ensure your composer's `bin` folder has been added to your system path.
@@ -17,7 +17,7 @@ Ensure your composer's `bin` folder has been added to your system path.
 You can still require this module as a project dependency if you don't want to install it globally, of course:
 
 ```shell
-composer require --dev silverleague/console
+composer require --dev silverleague/ssconsole
 $ vendor/bin/ssconsole
 ```
 
diff --git a/src/Command/Member/AbstractMemberCommand.php b/src/Command/Member/AbstractMemberCommand.php
new file mode 100644
index 0000000..53cda5c
--- /dev/null
+++ b/src/Command/Member/AbstractMemberCommand.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace SilverLeague\Console\Command\Member;
+
+use SilverLeague\Console\Command\SilverStripeCommand;
+use SilverStripe\Security\Member;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Provides a base for member related commands, lookups etc
+ *
+ * @package silverstripe-console
+ * @author  Robbie Averill <robbie@averill.co.nz>
+ */
+abstract class AbstractMemberCommand extends SilverStripeCommand
+{
+    /**
+     * Get a member by the provided email address, output an error message if not found
+     *
+     * @param InputInterface $input
+     * @param OutputInterface $output
+     * @return Member|false
+     */
+    protected function getMember(InputInterface $input, OutputInterface $output)
+    {
+        $email = $this->getOrAskForArgument($input, $output, 'email', 'Enter email address: ');
+        if (empty($email)) {
+            $output->writeln('<error>Please enter an email address.</error>');
+            return false;
+        }
+
+        /** @var Member $member */
+        $member = Member::get()->filter('email', $email)->first();
+        if (!$member) {
+            $output->writeln('<error>Member with email "' . $email . '" was not found.');
+            return false;
+        }
+
+        return $member;
+    }
+}
+
diff --git a/src/Command/Member/ChangeGroupsCommand.php b/src/Command/Member/ChangeGroupsCommand.php
index ce27435..0f5812d 100644
--- a/src/Command/Member/ChangeGroupsCommand.php
+++ b/src/Command/Member/ChangeGroupsCommand.php
@@ -2,9 +2,7 @@
 
 namespace SilverLeague\Console\Command\Member;
 
-use SilverLeague\Console\Command\SilverStripeCommand;
 use SilverStripe\Security\Group;
-use SilverStripe\Security\Member;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -16,7 +14,7 @@
  * @package silverstripe-console
  * @author  Robbie Averill <robbie@averill.co.nz>
  */
-class ChangeGroupsCommand extends SilverStripeCommand
+class ChangeGroupsCommand extends AbstractMemberCommand
 {
     /**
      * {@inheritDoc}
@@ -34,16 +32,14 @@ protected function configure()
      */
     protected function execute(InputInterface $input, OutputInterface $output)
     {
-        $email = $this->getOrAskForArgument($input, $output, 'email', 'Enter email address: ');
-        $member = Member::get()->filter('email', $email)->first();
+        $member = $this->getMember($input, $output);
         if (!$member) {
-            $output->writeln('<error>Member with email "' . $email . '" was not found.');
             return;
         }
 
         if ($member->Groups()->count()) {
             $output->writeln(
-                'Member <info>' . $email . '</info> is already in the following groups (will be overwritten):'
+                'Member <info>' . $member->Email . '</info> is already in the following groups (will be overwritten):'
             );
             $output->writeln('   ' . implode(', ', $member->Groups()->column('Code')));
             $output->writeln('');
@@ -55,7 +51,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         $newGroups = $this->getHelper('question')->ask($input, $output, $question);
 
-        $output->writeln('Adding <info>' . $email . '</info> to groups: ' . implode(', ', $newGroups));
+        $output->writeln('Adding <info>' . $member->Email . '</info> to groups: ' . implode(', ', $newGroups));
         // $member->Groups()->removeAll();
         foreach ($newGroups as $group) {
             $member->addToGroupByCode($group);
diff --git a/src/Command/Member/ChangePasswordCommand.php b/src/Command/Member/ChangePasswordCommand.php
index dbca444..7acfd00 100644
--- a/src/Command/Member/ChangePasswordCommand.php
+++ b/src/Command/Member/ChangePasswordCommand.php
@@ -2,9 +2,7 @@
 
 namespace SilverLeague\Console\Command\Member;
 
-use SilverLeague\Console\Command\SilverStripeCommand;
 use SilverStripe\ORM\ValidationResult;
-use SilverStripe\Security\Member;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -15,7 +13,7 @@
  * @package silverstripe-console
  * @author  Robbie Averill <robbie@averill.co.nz>
  */
-class ChangePasswordCommand extends SilverStripeCommand
+class ChangePasswordCommand extends AbstractMemberCommand
 {
     /**
      * {@inheritDoc}
@@ -41,10 +39,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
             return;
         }
 
-        /** @var Member $member */
-        $member = Member::get()->filter('email', $email)->first();
+        $member = $this->getMember($input, $output);
         if (!$member) {
-            $output->writeln('<error>Member with email "' . $email . '" was not found.');
             return;
         }
 
diff --git a/src/Command/Member/CreateCommand.php b/src/Command/Member/CreateCommand.php
index e23fd30..ff61b2d 100644
--- a/src/Command/Member/CreateCommand.php
+++ b/src/Command/Member/CreateCommand.php
@@ -49,6 +49,13 @@ protected function execute(InputInterface $input, OutputInterface $output)
             return;
         }
 
+        // Check for existing member
+        $member = Member::get()->filter(['Email' => $data['Email']])->first();
+        if ($member) {
+            $output->writeln('<error>Member already exists with email address: ' . $data['Email']);
+            return;
+        }
+
         $member = Member::create();
         foreach ($data as $key => $value) {
             $member->setField($key, $value);
diff --git a/src/Command/Member/LockCommand.php b/src/Command/Member/LockCommand.php
new file mode 100644
index 0000000..dffd64c
--- /dev/null
+++ b/src/Command/Member/LockCommand.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace SilverLeague\Console\Command\Member;
+
+use SilverStripe\ORM\FieldType\DBDatetime;
+use SilverStripe\Security\Member;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Lock a user
+ *
+ * @package silverstripe-console
+ * @author  Robbie Averill <robbie@averill.co.nz>
+ */
+class LockCommand extends AbstractMemberCommand
+{
+    protected function configure()
+    {
+        $this
+            ->setName('member:lock')
+            ->setDescription('Lock a member account')
+            ->addArgument('email', InputArgument::OPTIONAL, 'Email address');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $member = $this->getMember($input, $output);
+        if (!$member) {
+            return;
+        }
+
+        $lockoutMins = Member::config()->get('lock_out_delay_mins');
+        $member->LockedOutUntil = date('Y-m-d H:i:s', DBDatetime::now()->getTimestamp() + $lockoutMins * 60);
+        $member->FailedLoginCount = 0;
+        $member->write();
+
+        $output->writeln('Member <info>' . $member->Email . '</info> locked for <info>' . $lockoutMins . ' mins.</info>');
+    }
+}
+
diff --git a/src/Command/Member/UnlockCommand.php b/src/Command/Member/UnlockCommand.php
new file mode 100644
index 0000000..ca55102
--- /dev/null
+++ b/src/Command/Member/UnlockCommand.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace SilverLeague\Console\Command\Member;
+
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Unlock a user
+ *
+ * @package silverstripe-console
+ * @author  Robbie Averill <robbie@averill.co.nz>
+ */
+class UnlockCommand extends AbstractMemberCommand
+{
+    protected function configure()
+    {
+        $this
+            ->setName('member:unlock')
+            ->setDescription('Unlock a member account')
+            ->addArgument('email', InputArgument::OPTIONAL, 'Email address');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $member = $this->getMember($input, $output);
+        if (!$member) {
+            return;
+        }
+
+        $member->LockedOutUntil = null;
+        $member->FailedLoginCount = 0;
+        $member->write();
+
+        $output->writeln('Member <info>' . $member->Email . '</info> unlocked.');
+    }
+}
+
diff --git a/tests/Command/Member/CreateCommandTest.php b/tests/Command/Member/CreateCommandTest.php
index 1445900..0eedf6e 100644
--- a/tests/Command/Member/CreateCommandTest.php
+++ b/tests/Command/Member/CreateCommandTest.php
@@ -50,14 +50,19 @@ public function testExecute()
 
         $this->command->getApplication()->getHelperSet()->set($questionHelper, 'question');
 
-        $tester = $this->executeTest(
-            [
-                'email'    => 'unittest@example.com',
-                'password' => 'OpenSe$am3!'
-            ]
-        );
+        $tester = $this->executeTest([
+            'email'    => 'unittest@example.com',
+            'password' => 'OpenSe$am3!',
+        ]);
         $output = $tester->getDisplay();
         $this->assertContains('Member created', $output);
+
+        $tester = $this->executeTest([
+            'email'    => 'unittest@example.com',
+            'password' => 'OpenSe$am3!',
+        ]);
+        $output = $tester->getDisplay();
+        $this->assertContains('Member already exists', $output);
     }
 
     /**
diff --git a/tests/Command/Member/LockCommandTest.php b/tests/Command/Member/LockCommandTest.php
new file mode 100644
index 0000000..2f9929c
--- /dev/null
+++ b/tests/Command/Member/LockCommandTest.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace SilverLeague\Console\Tests\Command\Member;
+
+use SilverLeague\Console\Tests\Command\AbstractCommandTest;
+use SilverStripe\Security\Member;
+
+/**
+ * Test the lock member command
+ *
+ * @package silverstripe-console
+ * @author  Robbie Averill <robbie@averill.co.nz>
+ */
+class LockCommandTest extends AbstractCommandTest
+{
+    /**
+     * Delete fixtured members after tests have run
+     */
+    protected function tearDown()
+    {
+        parent::tearDown();
+
+        $testMember = Member::get()->filter(['Email' => 'sometestuser@example.com'])->first();
+        if ($testMember && $testMember->exists()) {
+            $testMember->delete();
+        }
+    }
+
+    protected function getTestCommand()
+    {
+        return 'member:lock';
+    }
+
+    public function testExecute()
+    {
+        $member = $this->createMember();
+        $this->assertFalse($member->isLockedOut());
+
+        $tester = $this->executeTest(['email' => 'sometestuser@example.com']);
+        /** @var Member $member */
+        $member = Member::get()->byID($member->ID);
+        $this->assertContains('Member sometestuser@example.com locked for', $tester->getDisplay());
+        $this->assertTrue($member->isLockedOut());
+    }
+
+    public function testMemberNotFound()
+    {
+        $result = $this->executeTest(['email' => 'pleasedontfindme@example.com']);
+        $this->assertContains('Member with email "pleasedontfindme@example.com" was not found.', $result->getDisplay());
+    }
+
+    /**
+     * Creates a dummy user for testing with
+     *
+     * @return Member
+     */
+    protected function createMember()
+    {
+        $member = Member::create();
+        $member->Email = 'sometestuser@example.com';
+        $member->Password = 'Opensesame1';
+        $member->write();
+        return $member;
+    }
+}
diff --git a/tests/Command/Member/UnlockCommandTest.php b/tests/Command/Member/UnlockCommandTest.php
new file mode 100644
index 0000000..e081bf0
--- /dev/null
+++ b/tests/Command/Member/UnlockCommandTest.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace SilverLeague\Console\Tests\Command\Member;
+
+use SilverLeague\Console\Tests\Command\AbstractCommandTest;
+use SilverStripe\Security\Member;
+
+/**
+ * Test the unlock member command
+ *
+ * @package silverstripe-console
+ * @author  Robbie Averill <robbie@averill.co.nz>
+ */
+class UnlockCommandTest extends AbstractCommandTest
+{
+    /**
+     * Delete fixtured members after tests have run
+     */
+    protected function tearDown()
+    {
+        parent::tearDown();
+
+        $testMember = Member::get()->filter(['Email' => 'somelockeduser@example.com'])->first();
+        if ($testMember && $testMember->exists()) {
+            $testMember->delete();
+        }
+    }
+
+    protected function getTestCommand()
+    {
+        return 'member:unlock';
+    }
+
+    public function testExecute()
+    {
+        $member = $this->createMember();
+        $this->assertTrue($member->isLockedOut());
+
+        $tester = $this->executeTest(['email' => 'somelockeduser@example.com']);
+        /** @var Member $member */
+        $member = Member::get()->byID($member->ID);
+        $this->assertContains('Member somelockeduser@example.com unlocked', $tester->getDisplay());
+        $this->assertFalse($member->isLockedOut());
+    }
+
+    public function testMemberNotFound()
+    {
+        $result = $this->executeTest(['email' => 'pleasedontfindme@example.com']);
+        $this->assertContains('Member with email "pleasedontfindme@example.com" was not found.', $result->getDisplay());
+    }
+
+    /**
+     * Creates a dummy user for testing with
+     *
+     * @return Member
+     */
+    protected function createMember()
+    {
+        $member = Member::create();
+        $member->Email = 'somelockeduser@example.com';
+        $member->Password = 'Opensesame1';
+        $member->LockedOutUntil = '2099-01-01 01:02:03';
+        $member->write();
+        return $member;
+    }
+}
diff --git a/tests/Command/Object/ExtensionsCommandTest.php b/tests/Command/Object/ExtensionsCommandTest.php
index 0d75680..a6b5f3b 100644
--- a/tests/Command/Object/ExtensionsCommandTest.php
+++ b/tests/Command/Object/ExtensionsCommandTest.php
@@ -4,8 +4,7 @@
 
 use SilverLeague\Console\Tests\Command\AbstractCommandTest;
 use SilverStripe\Assets\AssetControlExtension;
-use SilverStripe\Forms\GridField\GridFieldDetailForm;
-use SilverStripe\Versioned\VersionedGridFieldDetailForm;
+use SilverStripe\Security\Member;
 
 /**
  * @coversDefaultClass \SilverLeague\Console\Command\Object\ExtensionsCommand
@@ -26,10 +25,10 @@ protected function getTestCommand()
      */
     public function testExecute()
     {
-        $tester = $this->executeTest(['object'  => GridFieldDetailForm::class]);
+        $tester = $this->executeTest(['object' => Member::class]);
         $output = $tester->getDisplay();
-        $this->assertContains(VersionedGridFieldDetailForm::class, $output);
-        $this->assertContains('silverstripe/versioned', $output);
+        $this->assertContains(AssetControlExtension::class, $output);
+        $this->assertContains('silverstripe/assets', $output);
     }
 
     /**