Don't bow to their pressure! If it's unsuitable, then let them know. Certainly don't let them tell you to "suck it up" and agree to it anyway.
Store manager tried changing me from a 5/5 roster to a 6/4, and with my uni schedule it would have been one massive week for me. I certainly didn't accept this contract, I rejected it and renegotiated. Stood my ground and got something that suited me and my bosses.
It's a bit late to go back to your original roster now, but once you negotiate with them to something suitable, don't ever let them tell you to "suck it up". They can be intimidating, but you have to get past that because otherwise they'll just walk all over you. If you're in the union, get onto your union rep to see what your options are.
Anyway I have a question. Big complicated scenario happening on Friday night, CSM is taking personal leave, there is already like no one working at the front, but they won't be replacing her all-day shift. I am contracted operator shift to close the store, the 2ic is supervising the close as well. However, 2ic is going to have to work through the day instead, and they aren't replacing her shift, leaving only me to supervise. Am I entitled to refuse supervising that night? I am sick to death of having customers everywhere, there is going to be no floor staff to call on that night, and no work will get done at all. I think I'll have one operator until 9 and that's it.
I don't know how much longer I can work at this place. My store is such a toxic work environment that continues to spiral downward with each passing week. More and more cuts, more work to do, customers waiting, there's just so much pressure.
EDIT: So according to the online roster, the last operator finishes at 7. Then it's just me, all by myself for 2.5 hours. It actually makes me want to cry.