What do you guys think of this joke?

One day a man was walking down the street, suddenly he comes across a woman crying by her parked car at the drivers side. He goes over to her and says "Ms what's the problem?". She replies "my keys are locked in the car and I need to pick up my kid from kindergarten". He says "I can help but you need to turn around". She asks why but he tells her to please do it. She hesitantly turns around and 5 seconds later she hears a click and the door opens. She says "that's amazing how did you do that?", he replies "I'm wearing my khaki(car key) pants".