I doubt they meant literally forced, but so far no one in sl in my store has ever signed that sheet to volunteer for it lol and that hasn't stopped us from being scheduled. This year's leadership didn't do a volunteer sheet, though. I volunteered sorta one year (after no one signed up, I told my etl I would), and I would've this year, but only because I was/am hoping one of the people who really didn't want it don't get scheduled.
No one gets it off in my store unless they're on loa. Coworker requested it 6 months prior last year, they approved it, then when the schedule went up, she was scheduled. She was pissssssed. But sure, no one held a gun to her head, so I guess we won't call that being forced to work.