Often the door latch/lock assembly is crudded up from years of old lube dried out.

I had a similar problem and it was solved by cleaning all the latch area in the door and relubing it. Door closed normally again.

Ideally, remove the latch assembly from the door. Soak it and clean it completely. Use lithium grease or a really good synthetic paste.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)