Use APKPure App
Get UnMute 88 old version APK for Android
मौन और फिर पीठ पर फिर से
Set your phone to mute, and let it automatically return to normal after a time you decide yourself.
If you ever forget to turn sound back on this tool is for you.
Integration with Calendar: turn off sound automatically when you are in a meeting, and back on when it is over.