Date registered: Jan 2004
Vehicle: W123, W201
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It is possible the rod that connects the tumbler to the locking mechanism is no longer connected to the locking mechanism inside the door. Or, the mechanism is stuck.
Opening the door and looking to inspect would be my recommendation.
It's happened to me before, except the door turned freely with no resistance. The rod I spoke about earlier was not connected to the mechanism. I had to loosen the handle (2 screws on door jamb inside black rubber cover, and 1 screw on front tip of handle accessed through inside panel of the door) and reposition to get the rod back in place.