Use APKPure App
Get Simple Silent Timer old version APK for Android
Mute the phone for a period of time without having to remember to restore it
Silent Mode Timer
Turn your phone on silent mode for a period of time.
When you turn your ringer off for a movie, meeting, this app turns it back on afterwards.
Great for sleep, class, the office and movies.
Enjoy the modern, easy to use user interface (material design).