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Looks like theres an arm on the handle that operates some type of cam that pulls on the lock cable. From photos of used handles it looks like the spring is greased where it meets the cable. Can check to see if thats properly greased or if its rusted.
The cable itself may be binding inside.
May have water penetrating into that door mechanism causing rust or corrosion. Hard to say without opening it up and inspecting.
Can always pull on the handle and spray some penetrating fluid all inside seeing if it works its way in there and frees up anything binding. A silicone spray would be the safest with plastic and rubber components. Though I cant see a little liquid wrench doing much harm.
Inspect the lock where it latches to the door frame. See if that is operating freely or binding.
Photos below are taken at random so may be of a right or left handed door.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
