Try Face Unlock

Some of this information applies only to devices running Android 4.4.

You can set an automatic screen lock for your device. When a lock is set, the screen locks when your device's display goes to sleep or if you press the Power button.

You can set locks of different strengths using lock settings:

  1. Go to Settings > Personal > Security > Screen lock.
  2. Touch the type of lock you'd like to use.

Face Unlock is one of the options available. After you've set it up, you can unlock your device simply by looking at it. Although Face Unlock is not very secure, it can be convenient and fun to use.

Tip: After you set up Face Unlock, look under Settings > Personal > Security for two additional settings: Improve face matching and Liveness check. Use these to make Face Unlock more reliable and secure.