I'm so terminally awkward about all this. Cuz I want to be sure that the person I'm about to ask for help isn't like on break or waiting for their shift to start or something and "Excuse me, are you on the clock?" Sounds super condescending to me. So I just awkwardly default to "Do you work here?" or "Do you know someone who can help me?" because English is basically impossible for my dumbass self.