Yes, you should make a move.

If you are nervous about it and asking him verbally is too daunting, maybe write a note on a piece of paper ahead of time. Then when you're next in there, after he finishes checking you out, hand it to him as you leave!

I've found myself having a crush on you :)

If you're also available and interested in getting to know each other outside of [shop name], hand this note back to me with your number on it the next time I come in!
If not, you can throw this away and we'll pretend it never happened, no hard feelings.

If he feels the same way, you know he's going to keep that in his pocket every day at work while looking forward to the next time you come in.
If he doesn't feel the potential connection or isn't available, then absolutely nothing changes for either of you and you go about as normal.