This is a rather simple fix. Open up the door and look on the inside of the door by the latch mechanism. Find the flat black circular rubber cover and pry it off. There is 2 of them that are about 7mm in diameter and a larger one at the top maybe 2-3 cm. Pry the 2 smaller ones off and find the one that has the 3mm hex anti-tamper screw in it. loosen it up but don't take it out (if you do take it out, no worries). Once thats done go to the outside of your car and pull the handle out as to open the car and at the same time pull it over towards the lock, or the part that is stuck. While doing that, get a flat head screw driver and start gently prying the stuck lock out from the outer part furthest to the right. It will loosen up so you can reposition it correctly. Repost the results when done.

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1990 190E 3.0L