Door doesn't load next map when clicked on.

[Rownbear]

No doesnt need to be a script if you use the leveldoors, just place one out, and click it, go to entity and you'll see a box there which says Mapfile. Then just click on it and find the map you want to load in your folders.

If you're not using the leveldoors and want to use normal doors you need to script a normal player interact script followed by
ChangeMap(string& asMapName, string& asStartPos, string& asStartSound, string& asEndSound);