If the struggle button says pretend struggle, then you need to press the cramped button instead until your mood lowers enough to return it to a regular 'struggle'. From there, just spam it over and over again and you'll get out, which shouldn't take too long. Took me a bit to realize this and I spent a few in-game weeks stuck inside trying escape and ask to be let out to no avail. Thought that maybe the chat she had with Fitria when I was depressed would make her let me out but she doesn't seem to give a shit.