Seriously?
Is a customer there for 8 hours at a time, or just in and out?
Is a customer behind the counter?
Is a customer likely to make several employees sick in the same day, causing staffing issues and potential loss of business hours?
Is a customer likely to come in contact with all the other customers over an 8 hour shift, potentially infecting several of them?
Fortunately, I make a point of hiring smart people. They all got vaccinated on their own, and about half of us are boosted so far. Should it come down to it, I will not keep employees who pose an extra risk to the rest of us, but it’s unlikely to come down to that.