Drivers side lock jammed

i'm having trouble getting the lock button to come up and done. The remote is operating fine because all the other doors lock/unlock fine, but the car beeps at me unless i physically push the drivers button down before i get out.

The button goes up and down normally if i use the key to get in or pull on the interior handle, otherwise it's stuck. I can hear the motor running when i press the switch by the steering wheel or use the remote, and it sounds normal... i think.

I read in another post that the button can get sticky and can come loose if you lubricate it. Does the door trim just pull off the strip of metal connected to the button, or do you remove the plastic surrounding the button on the interior?

Should i give this a go, or does the motor need to be replaced?

Any suggestions would be a great help.