Step 4Try it out!
The first few times you might find it easiest to hold it between finger and thumb (first two images) to make sure you can line it up correctly, and to get a feel for how much force you need to use. But fairly soon you'll be able to palm the masher and hide it (third image). If you become skilled enough at doing it in a fluid motion, it really can look (to anyone else walking past) as if you're just slamming your palm against the keypad and somehow unlocking the door...
If you're so minded, it would be easy to improve the fit of the masher into your hand, giving it more comfortable edges or making it from something transparent or flesh-coloured so it's even easier to hide. Or make a set of keypad masher knuckledusters, where it looks like you're literally punching the keypad with your fist to get access. Or an elbow-pad!
Alternatively, you could stick the key-pressing bits on the back of a card which looks like some kind of official access card anyway, so that you appear to have a kind of contactless swipe card that simply needs to be pressed against the keypad.
Some risks: Don't label your masher with the code, or the room number. You're basically creating a device which changes the security of the keypad from a"what you know" method (a code) to a "what you have" method (a key). If you lose it, and it has the room number on it, then it's equivalent to losing a key with the room number written on it.
Be careful, but have fun!
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