If you’re scheduled to get off at a certain time aren’t you supposed to get off at that time?

I’m supposed to be working only from 10-6 and I told my work that since I’m scheduled to get off at 6 I’m getting off at six and they are like if we don’t get this done or that done no one can leave I just think that if you are scheduled from a certain to a certain you should get off at that time idk.
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