AddPropImpulse not working [SOLVED]

[Linus Ågren]

Still doesn't do anything O.o
In my first map, I had

AddPropImpulse("prison_4", 1.0f, 0.0f, 1.0f, "World");

And that threw my door open really good.

Edit: It works if the door is open a bit now, but it won't slam open if closed.