Opening Door - Please Help

I made a model of a door, and I want it to open when a player walks into it.
I have made this work with a standard cube and a hinge joint. Why wont it work with the blender model I made?
Please tell me how to do this.


Here is the door model in-game

Importing objects from blender or any other 3D modelling software is always tricky. When importing you’ll have to make sure 1 unit in blender equals 1 unit in Unity. Also make sure that the pivot is centered (your picture tells me it’s not) and that the xyz axes match. There are numerous topics on correctly importing from blender to Unity. Good luck!

EDIT: This post might help you