When I started working for my current job I applied for a role that starts later and was told that if I need to travel there will be small accomodations, today when I asked if I can leave 10 minutes early when there is 4 staff for a closing that requires 3 I was told off and said they’ll let me off

I have to travel over an hour on the bus, my buses go in 40, wp minute intervals, leaving 10 minutes early saves me 40 minutes, I have wake up at 7 tomorrow to make it at 10. When I asked about 10 minutes supervisor said “these are the hours on rota these are the hours you signed up for when starting the job”, even though I have signed up for a role that starts 11 earliest, and when asking for small wiggle room during my interview they said that'll be fine