My dentist never asked if I got the shot. I don't even need to wear a mask when I enter his office. His staff don't wear masks. Some patients in the waiting room still do (as of a few weeks ago). But masks and vaccine are optional in his office.
Clerks at my supermarket wear masks. All of them. So too the barristas at the coffee house. But most (not all) patrons don't.
The situation with supermarket clerks is a special case.