Sergio, if you don't know where to take the x, y and z, this little HUD can help you.
You just have to go on Settings > Hud > List. Just leave List selected and click on Options all up and select "New".
On this new Hud "Hudx" you insert the following code on Script:
After inserting the code, toggle enable on the hud to yes. Enable the Hud just created and the global Hud.
addtext("X Position:", 10, 30)
addtext("Y Position:", 10, 45)
addtext("Z Position:", 10, 60)
addtext(posx, 100, 30)
addtext(posy, 100, 45)
addtext(posz, 100, 60)
This will show on your game screen your instant position, you can notice that if you walk, it changes too.
Get the x, y and z of your door inside and outside.
I hope I have helped. If yes, please rep me