I think there's a bug with the door missing the handle. I tried using the bent wire on it, but it's not working. I even restarted the game, but no luck.
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The truth is, that small door is actually missing a legit handle. When you opened it with the bent wire was the actual bug. You can use the wire in a ventilation hole near the ceiling in the downstairs area.
Before you proceed I definitely recommend to download the most recent release. I have internet connection difficulties but an hour and it will be up.