Exactly what I was looking for!

This app has changed the mood in our house when it comes to dealing with the kids with tv and video games. For the few people who complained the app doesnt lock the device, know that iPhone apps cant do that. Its not a limitation of this app (and it doesnt claim to be). This app is best used with parent involvement. Great response from the developer for questions, too. It sounds like there are quite a few nice updates planned that I hope to see soon.

Michael_Parkinson about Screen Time - Media Time Manager