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Hello. Welcome to Just Answer. Please allow me to assist you. This sounds very much like you either have something detached inside the door, at the door latch. In order for you to get the door panel off. The only way this can happen is to remove the driver seat form the vehicle, and set it outside of the vehicle. You cannot get the door panel off to inspect the door latch attachment points with the driver seat in place. Most likely, the clip that holds the lock/unlock rod to the latch assembly has come off. yes, the lock 'locks and unlocks', but the physical movement of the lock is not unlocking where it is actually at on the door latch. If you have any questions, please feel free to reply. Thanks
On the side of the latch you will see the solenoid that causes the doors to lock/unlock. See if the link is connected. Use the lock button to help you locate the solenoid and the link.