One tip for the introverts out there:

When the service worker and you do the back and forth of "How are you doing today" - "Fine, you?" - "Fine"

Yeah don't do that, try out this phrase "It's my Monday" [0] instead of "Fine, you?"

You'll typically have them telling you what day of their work week they are in which is not usually the actual day of the week! Because managers schedule people in service positions in wacky ways.

That little bit of human connection around labor and work, man it does wonders. They know you know what it's like, that you see them as a person, and you care a little bit. Really gets the conversation going if there isn't too much of a line.

[0] Use any day of the week, but do use a weekday. Monday or Friday works best though.