Working overtime (w/out pay) to give someone else break time

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My company has required that I and a few other employee take 15 minutes away from our desk to cover for the receptionist. The receptionist needs to take her 15 minutes break (2 – 15 min break) each day, so we have to go to her desk and cover for her. I don’t mind covering for anybody, the part that really P.O. me and many of the staff, nobody else takes a break only she does. So why should we stop our work, to cover her desk. Since this new assignment I had to stay 40 minutes later each day to finish my work. I don’t get paid overtime, I am on salaried. Now the Receptionist wants us to also learn how to use the postage machine (we got a new one). I don’t understand why, should we learn? I mean we only need to cover to answer calls, if there is any mail to handle. The receptionist should be expected to take care of that upon her break right? What do you think? This is so unfair… we all don’t take any breaks, but yet we are expected to cover for somebody else’s break time. Then end up losing valuable time on our desk and having to stay later to cover it. What do your company require you to do that seems unfair to you? Do you take break time ?