A Fallacy about why there Are Locks on Doors

At 1:30 in the morning you are driving down Walton Road when you pass the 7-11. You decide to stop in and treat yourself to a nice big slurpee. As you pull in the parking lot you notice that the sign says, 'We're open 24 hr's, 7 days a week, 365 days a year.' However, when you reach the door you notice that they have locks on the doors and you think to yourself, why do convenient stores have locks on their doors if they're going to be open 24 hours a day, 7 days a week, and 365 days a year?
If they're never going to close then they have no need for locks on the doors.
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