Do you hand your smartphone to your child, then set this timer which force-locks when it runs out. So your child has to hand it you back because the phone and screen are lock. This light utility app allows users to set a timer to lock phone and screen regardless of default system setting and whether user actively using or not. It will enforce entering password when the time is out. To start, cancel or modify are protected by the default password to prevent "smart kids" to overwrite it. This a