Theoretically most will say if you have seniority you should be able to force someone else into that job. Why did you get bumped from your "preferred job"? If you do try and say you have more seniority their excuse is probably going to be something along the lines of the other people were never trained and you already know the job so you are screwed. You can complain all you want, but most likely they will leave you there as long as you are doing the work. The best thing you can do is slow down and make them send someone else to help you. Don't make it too obvious though as then they will come after you for refusing to work or something. Just make sure to go slow and steady and not hurt yourself. I was in a similar spot a while ago as they kept pulling me off the sort isle and making me load. I didn't mind it too much, but they were always doing it to me and most of the time they never asked. It was more of a "you are going to load tonight whether you want to or not". Seems they can do a lot better if they were to simply say something like "Hey we need some loaders today, would you mind loading for the night?". Sounds like you made the cardinal sin of being "too good" when you first started and are now being targeted as their pawn. It sucks, but that is just how the company works. The lazy people get to stand around and do nothing all night, while the people that they can abuse are forced to do the work of 2 people. Just slow down and take your time and don't let them cause you to hurt yourself. Get someone to help you with all the heavy stuff.