If my Moto G5+ is locked then it seems that plugging in a keyboard behaves pretty much like plugging a keyboard into a desktop or laptop computer except that it doesn't respond to c-a-del.

I can unlock from the external keyboard by pressing the windows key and then typing my pin number but the multimedia keys and print screen on the keyboard work even with the screen locked.

I would rather that it didn't do any of that until I give permission on the mobile itself.