Grievance?

Western Region here (CA)

PT Sups asked me and some others if we wanted to stay longer for some air that was coming late, we said yes. Then he said it will probably be in 30 mins. Ok cool. He comes back and says we are being forced to a lunch break even tho it's been about 3hrs ish. Some of the others guys asked why and said that should only happen around the 5th hour and that we never get an actual lunch break. Then the PT Sup te us to start moving to air side while we were still on "break".

Is any of these cause for a grievance? I'm still only a year end so this is new to me. But all the other guys said it they will be following through with a grievance. Just looking for information to be more knowledgeable since my hub has been shafting us out of my breaks too. Tell us to just take it at the end of your shift.

Thanks in advance!