[SCRIPT] Can someone solve this ?

[FlawlessHappiness]

Please post your full script.

Yes, you could create a collide-function, but you don't have to create a timer.

To close a door by itself you have to use the function
void AddPropForce(string& asName, float afX, float afY, float afZ, string& asCoordSystem);

Use Ctrl+F or Cmd+F to find the function in your link.