How to build an app lock application using flutter?

Okay So I want to create an Mobile application for android and iOS through which the user can lock other apps I mean like put restrictions on other apps so that user no longer can access those apps and User will see a lock screen when he tries to open those apps and will be asked for passcode to unlock it also user can enable or disable the lock from the flutter app. I want to know is there any dart classes and flutter packages(If available) I can use to build it. I tried to study about method channels but failed so please share any related documentations as well