Try Face Unlock
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:
- Go to Settings > Personal > Security > Screen lock.
- 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.