Sharan drivers seat faulty door?

I have a VW Sharan 2001,im having problem with my drivers seat door it started when i open the door manualy with my key since then when i open the glass shield halfway i can hear a clank sound and like the glass shield is crassed at the bottom part and i cannot open the door from outside but it works when you open from inside.I wonder if its just a simple problem that i can fix but dunno how to open it?