Используйте приложение APKPure
Историческую версию App Lock (Keypad) можно получить на Android
App Блокировка клавиатуры
App lock is security tool which helps you to protect your phone from annoying people by locking your applications from public access, only you will be able to unlock them again. With app lock you can lock your applications using either PIN or lock pattern.
Features:
*Able to use pictures from smartphone of user for lock screen.
*Support pattern unlock and password unlock.
*Lock 3rd party apps and system apps.
*Clean interface and easy to use.