WHY THE DRIVER SIDE DOOR WON'T UNLOCK AT ALL? on 2007 Scion tC

THE DRIVER SIDE WON'T UNLOCK OR LOCK WHEN I USE MY KEY OR WHEN I LOCK/UNLOCK FROM THE INSIDE I WOULD LIKE TO KNOW WHAT COULD BE CAUSING THAT AND HOW MUCH WILL IT COST TO FIX IT.

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2 answers
POSSIBLE ACTUATOR ISSUE...ABOUT THREE HUNDRED BUCKS.
DOOR LOCK SOLENOID