They don’t need to take a shift off to come to my place of work because I work on an office where the customers are people doing their job.

And if they needed to take a shift off to come to my place of work, it would only be because they work at the same hours as I do. If they worked different hours they wouldn’t need to take a shift off.

Taking a shift off every time you need to shop (at least once per week) isn’t moving mountains?