Use APKPure App
Get Switch Off and Lock screen old version APK for Android
Cliquez sur l'icône 'Off' éteindra / verrouiller votre écran. Simple, gratuit et sans publicité.
Free application Off will lock your screen.
With Off you can lock your screen with 1 tap. With "Off" you can reduce the amount of times you press the power button to extend your device's life.
Note: Before uninstalling you have to go to "Settings" -> "Security" (or "Location & security" ) -> "Device Administrators" and make the "Off" app unchecked.