I'd like to briefly praise the author for working on this project and making it available for free on F-Droid. The state of android security is abysmal.

My 12 year old has discovered how to defeat just about any Android lock, including AppLock. When you pull up settings, you get a split second before the lock screen come up. If you switch apps, back and forth, you get many split seconds. If you are patient, you can, very slowly, navigate through settings till you get to accessibility permissions. From there, you can revoke accessibility on AppLock and it stops working.