can we clock in 15 early

i clocked in today 14 minutes before my shift started, i work in service and one of our huddle topics this week was to make sure we’re not clocking in 14 before and to only use the 14 for emergencies. I was not informed of this before and when i heard it i was a little shocked as this wasn’t a problem before. later in the day my manager called me into their office saying that i shouldn’t have done that and that instead of leaving at my set time, i would leave 15 minutes before. I’m only coming on here really to complain because if the option to clock in early is there why wouldn’t i, i’m not gonna not work and i’m not expecting anything from it either.