Your door lock actuator is malfunctioning. They run about 150$ and require someone with know-how to do in 30min. A back yard mechanic that hasent taken a door pannel off before. Possibly 2 hours.
Since yours is a coupe your going to have to unbolt the window from the regulator, remove the 2 10mms on the left side of the door and pull that side of the regulator out of the way. then there are 3 T30 torx by the door latch that you need to remove, a cable that you pull off that connects your exterior door handle to the lock actuator andunplug the actuator. Then you can shimmy it out. The door pin and cables that attaches to the inside door handle need to be switched over to the new one.
Also if you have front side airbags they have to come off, but remember DO NOT turn the key on while the air bag is unpluged or you will have an airbag light that will have to be cleared. Also dont have the key on while you plug the airbag in or it suppoustly goes off in yoru face, or so im told.