Slowly Opening Door

[ApeCake]

Hello guys. I want my (elevator) door to be slowly opening, after I did something (putting two rods in the right places). I've been using AddPropForce for this. However, I needed to input high numbers to see an effect; this results in the doors smacking so hard open that it closes right after... is there any code to get a door SLOWLY opening, like in the beginning of Followed by Death: Chapter 1? Or do I just fiddle around with the numbers of AddPropForce till I get the right number?

And as far as I know, the doors open on the Z-axis. But I'm not sure, I just went in the level editor, and pulled the doors the way they need to open, and Z went higher as I did so.