https://www.techdotmatrix.com/2016/02/an-app-to-to-catch-people-who-try-to-unlock-your-android/
Lockwatch app to Catch People trying to Unlock Your Android device - TechDotMatrix
Aug 24, 2018 - Lockwatch App sends an email to the registered email with a picture from the front camera of the person who is trying to unlock your device.
android devicelockwatchappcatchpeople