Am I obligated to show up to work on time if they keep me late anyway?

I work at a grocery store and am sometimes 3-10 minutes late. No one has said anything, but I try to be on time. Thing is, often I can’t leave until someone has pulled a new drawer and is ready to take over for me. If they clock in at the time I clock out, by the time they’ve pulled a drawer and I’ve finished... show more I work at a grocery store and am sometimes 3-10 minutes late. No one has said anything, but I try to be on time. Thing is, often I can’t leave until someone has pulled a new drawer and is ready to take over for me. If they clock in at the time I clock out, by the time they’ve pulled a drawer and I’ve finished counting and signing off on everything, it’s 20 past my scheduled time. Am I obligated to clock in on time if they never let me clock out on time?
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