Also, don't come in when it's time to close. I'm clearly not allowed to close my gate on you or tell you to gtfo, so please just have some consideration. You know its after hours.
Back in the days when I worked retail, our managers loved to accommodate late shoppers because it was one last chance to increase sales for the day.  The stores I worked for always had a number of sales that they either wanted to hit or beat.  As an employee, I hated late shoppers, but it's good for business.