features :
1. Open System's Default Power menu
2. Lock the Phone Screen
3. Volume buttons for Screen Locking

this app Uses BIND ACCESSIBILITY SERVICE permission to perform Global Actions like :
1 . Lock The Screen
2. Open System's Default power Menu
3 . monitor key events of volume button For Screen locking

Important , a device can only be turned on by the hardware power button , as far as we know . so please only turn of your phone if your device's hardware power button is functional

Uses ACCESSIBILITY API to perform those 3 operations mentioned above