Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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This type of fault here is usually caused by a faulty door latch itself.Even though the door lock is operating up and down like this here this can be the door latch itself at fault as I have seen fail several times before needing replaced.You will have to have a lock smith come out to open the door then the latch itself can be replaced.The only other option is to remove the interior door paneling as best as possible to access the latch to trigger it open but with the door being stuck closed this can damage the door paneling to where it will need replaced or repaired after the latch is replaced so it is best to have a lock smith come out to unlock the door or a AAA service.