For 1990-2009 cars

If you press the power door lock switch when the key is in the ignition and any door is open, all the doors will lock and only the driver's door will unlock. Be sure to remove the key from the ignition when locking your vehicle.

If the keyless entry transmitter is used to lock the doors and the key is in the ignition, a chime will sound three times. All passenger doors will lock, but the driver's door will remain unlocked.