Found: Need help finding title

Genre: I believe it was magical realism
Published: either late 1990s or earl 2000s
Plot: GAH! So from what I remember... a young man is working at a bookstore or antique store. An old man runs it or owns it...maybe he's thinking of letting it go. I can't remember if the old man is his relative or not. I can't remember any other details.
Audience: It's for adult readers.
The author is male.

Did I even give enough info for someone to help me out?

Please read: https://www.librarything.com/topic/329521

A stretch, but maybe Exchange by Paul Magrs?

That's a fairly vague plot. Maybe Mr. Penumbra's 24-hour Bookstore?

This was reposted under a different title, and found: https://www.librarything.com/topic/333299