One of the utmost features on the Android 4.0 Ice Cream Sandwich operating system is the cool feature called Face Unlock. Although this is a native feature available only on ICS devices we have the pleasure to inform the Android universe that this feature is now available for Android 2.3 Gingerbread devices as well, all this thanks to this guy adnanahmad1786.
Use FaceLock to protect your apps with by scanning your face! Your face is the key to unlock your Android device or any application you choose to lock and protect. With FaceLock for apps, you don’t need to wait for Android 4.0 to use face unlock on your phone, because it lets you choose individual apps you want to protect.
The free version will lock to protect apps like : Google Play Store, Task manager, Settings and one app of your choice, while the PRO version gives you the option to lock the whole device by using FaceLock for Apps as the main lockscreen.