It is important to know that the app hidden "Key Lock" can notberun directly, so it is necessary to install an app thatisresponsible for searching and launching it, locking nativelythedevice.
Tested on Huawei P9 Lite + Marshmallow + EMUI 4.1
Note: only valid for devices with the "Key Lock" app installed.
Note 2: there exist devices with the "Key Lock" appinstalled,but it is not runnable.