Quite a number of years ago, I worked a lot with a blind musician friend. I marveled at how he could play keys without seeing them. He also had perfect pitch, but that's another subject.
Anyway, mostly out of curiosity, I started trying to play some without looking at the keys. After a while it gets pretty easy, especially in keys where I am comfortable.
Downside--if I do that too much people are even more skeptical that I'm really playing.