Hi - very sorry I didn't see this post until now. I didn't get a notification for some reason.
That's strange. The door should be opening way before you get there. I can only guess that the game is running way to slow.
I've realised that the recommended system specs were missing from the itch store page, so I've added them now. I'm guessing that maybe your machine might not be able to run it.
If you paid for the game feel free to request a refund.