Is it illegal to be forced to clock in 15 mins early but not get paid for it.

So a company made a rule that staff has to clock in 15 mins before and after you shift to be considered on time. So if you work 6am-2pm you must clock in at 5:45am and clock out at 2:15pm in order to get paid. You are not expected to do anywork during that time. You actually start working at 6am . So basically sitting till your start time.The reasoning is that the actual job site might be 10 min drive from the time clock.