When you open the door theres a spring in your latch [censored]. that should pop the latch open I would replace that spring you can get them from one of the venders maybe the springs are old or just not good springs if you have the door open and push the latch closed when the door is still open you should see and hear it snap in then when you pull the door handle to open you should see it and hear it pop open if the spring is weak it will not reset itself when you open the door.

Pete