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there are no other ways)
but I found a hidden room of decent size, there was some junk lying around, and also a dog... I thought it was dead, but no, it got up later. I was checking the save in that room, thinking maybe there was a key there)) g
it's nonsense in general, but you can assume why I had such a dream)
why one key for one activation? - it's an analogy with an antivirus key, which I don't know how to replace when it expires (I was just thinking about this yesterday)
there was also something about food, and I can explain this fact, and maybe even the walk down the street (I recently walked there and was looking for something, and in the dream I got lost), and maybe even this room, although I don't know...
you dream about what you think about, what worries you, etc.
not always, of course, I don't know what to attribute these knights to.