Headlight making a buzzing noise when closing

This evening when I parked my hardtop and went to turn off my lights, the driver side headlight made a buzzing sound once it was in the closed position. The buzzing sound would stop after about 3 seconds. I'm guessing that the headlight motor is still running. I really don't want to bring the car into the dealer, does anyone know how to fix this?

Thanks,
Chris