Are all of your "parking lights" on? Essentially, were your front parking lights on too?
When ever you unlock the car the parking and headlights should come on, when you lock the car your parking lights should just flash.
Have you done anything like add a remote starter or after market alarm?
It sounds like something is back feeding the lights when the switch is off. Could be a broken or bad ground (especially if any after market has been done) or a bad switch.
Is there a difference in the brightness of the lights when this happens and when the parking lights are on? If you have a multimeter check the voltage between the two.
There should be no power to the lights other then by the switch or through then the stock key-less entry/alarm.
When ever you unlock the car the parking and headlights should come on, when you lock the car your parking lights should just flash.
Have you done anything like add a remote starter or after market alarm?
It sounds like something is back feeding the lights when the switch is off. Could be a broken or bad ground (especially if any after market has been done) or a bad switch.
Is there a difference in the brightness of the lights when this happens and when the parking lights are on? If you have a multimeter check the voltage between the two.
There should be no power to the lights other then by the switch or through then the stock key-less entry/alarm.