About this scene
Boutique clothing store, mid-afternoon. She walks into the fitting room alone with three items over her arm. He follows thirty seconds later and slides past the staff at the front desk without anyone looking up. The fitting room door does not latch properly. He pushes it open quietly and she's already removing the dress she was supposed to be trying on. The sex is hard, fast, and the door swings open three inches at one point. Nobody walks past during the encounter. The whole thing is under five minutes.
What to watch for
The unlatched door is the suspense element. Watch it move during the encounter. It opens an inch around the ninety-second mark, then a little more by minute three. Neither of them reaches over to close it. The finish happens with the door clearly ajar and you can see the corner of the corridor visible through the gap. Nobody walks past, which is luck, but they were not relying on luck. They were relying on speed.