"Hey Manager Amy Zone, can I have a bit of time off for my leg to heal? It was just partially crushed by a stack of Prime Day boxes."
"Employee 3869310, in the time it took you to get across the warehouse to ask me that dumbass question, you just used up the last of your bathroom breaks for the day. As an act of mercy, here's my empty Amazon Basics Hyrdration Drink bottle. Just try not to piss all over the floor when you use it. Now get your ass back to work!"
I'm union (USPS) and the only thing I'd ever do that would require me to go to the union is a schedule change, and the only reason for that is so the union can make sure I'm of sound mind and making this decision out of personal interest and not at the request/insistence of management - I have a schedule and any time worked outside of that is at time and a half, so if management wants me to change my hours for them, they gotta start paying me 50% more, or just give me overtime. Unions are cool