Your machine regularly uses that key to access what's behind the door on your behalf; there is no reason you shouldn't be able to access it yourself. If you do

Your machine regularly uses that key to access what's behind the door on your behalf; there is no reason you shouldn't be able to access it yourself. If you don't find the key and realise it's actually a lost one, leading to a potentially dangerous place, someone else will and they won't be benevolent.