Surrealist/existencialist book featuring giant doors/gates that needed certain keys

I remember reading an excerpt for a test years ago that featured some of the following elements. I’m not sure that each of them was present:

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1.- Giant doors or gates. It gave a curiosity feeling of what they were and what was their purpose.

2.- Keys especific to each door that were like riddles or needed riddles to be found if i remember correctly.

3.- Gatekeepers that seemed to be sage riddlers in service of whoever wanted to go through the doors and gave the feeling of what or who are this guys and why are there here and why do they have this knowledge.

4.- Protagonist that either lost his memories or felt lost or was in kind of a fever dream. It seemed like he was going to understand or learn things of this experience. It felt surrealist and existencialist at the same time. Kinda like fusing Kafka and Camus together. It also gave a feeling of curiosity of the unknown which I only know from Lovecraft.

5.- I remember some description about geometrical shapes that gave it more of a surreal feeling.

6.- I remember it being either in space, in the void or under a starry night sky in the middle of nowhere. I also remember sand but I’m not sure. I saw there’s a book named “Doorways in the sand” and maybe that influenced me, because I haven’t been able to check it to see if it’s the one I’m looking for.

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If you are not sure, tell me either way each possibility. If you don’t know the book but you know similar books, I would also like suggestions, because I have been wanting to read something like this for a long time.

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by BustedBayou