Usage patterns
〈人〉に聞くto ask a store employee (for help or information)
I didn't know my size, so I asked a store employee.
〈人〉を呼ぶto call over a store employee
I called over a store employee to pay.
〈人〉として働くto work as a store employee
When I was a university student, I worked as a store employee at a convenience store.