How about when you're shopping? You've got your purse on your shoulder, drinking a smoothie & carrying a basket full of groceries and they stop and ask you for help.
You do not help them if you are clocked out or on a break. You are possibly not covered by work comp, its possibly illegal for the store. And never give your time away, its respect, cause a customer would flip their shit if they were asked to work on their lunch.
I have had them flip and complain and the STL had to explain that the employees were allowed to shop on their time and could not be required or obligated to answer any questions on their time. They are guests when they are not working. That guest was ready to explode that we couldn't be forced to work for free.