You can't get your kids out of the phone? are they constantly playing games or watching youtube videos? AutoTurnOff allows you to turn the screen off even if they are playing games or watching videos. Just install the app and select the amount of minutes you let them use the phone. It's also battery friendly since uses default android's system scheduling system.
We have integrated with Flic so with just a click turn the screen off! More information about Flic here https://flic.io/
This app uses the Device Administrator permission.