So I am watching Marks stream where he is talking about FNAF and i got an idea when Tylor said maybe there are two key keepers to the box... Now... I am not that big of a fan anymore (or so I thought) but Mark pulled me down again.
So Tylor and Mark most likely the two padlocks have two keys and two key keepers and they said that most likely it was the two creators of the animatronics and Afton/Purple guy is one of them, (but we know it’s not Afton since the books and the games are not the same canon)
But what if, it is not the two creators what if one belongs to another technician...
But let’s continue on the line that mister Afton created the animatronics of at least sister location as we know. Sister location is somewhere around number 4 I am guessing and maybe he created a key to open, close and kill animatronics instantly since Afton most likely worked at the last (or at least one) pizzeria in the past to know how to build and work the animatronics. A key to, be able to just prevent things to happen again. To be safe when near them so he won't be in danger if they go insane. But he is still a sick fuck wanting to kill children by making the animatronic of his child swallow them whole (baby).
But to know that there were more ways to shut them off, he gave the other key to his co-worker, the technician. The man he worked with for a few years, a man who knew all the animatronics , how they moved both day and night. How they act at all times. The man who saved our asses several times in both the first and second game. Phone guy or as we in the fandom likes to call him Scott. Scott has the knowledge of the animatronics to keep a key of them. Maybe he left it to a child before he died in night 4 of the first game. Also we can hear Scott/Phones voice in the fourth game which might hint at him being dad to that child and Scott recording some calls to some guards home since he knows after his child got damaged that they are dangerous. Maybe Afton made the key for Scott and his daughter sake for the same thing not to happen to their family again.
Maybe these keys are lost in our current time but in the fourth game they should be around... But I was only thinking :)