ScriptingProblems - Open door with 3 keys

Hi, I have a problem with my scripting. I'm doing a labyrinth game where you have to find 3 keys to open the final door to win the game. I can collect the keys and it counts up in a guibox but I can't open the final door and I have no idea why not. There are two scripts and a get the openfinaldoor var from the Keycollider script which is on my player. The Lockeddoorscript is obviously on my door. Can anyone help me please :) I would be so grateful.

LockedDoor.js

 var openfinaldoor:Keycollider; 
 
 
 
 // Smothly open a door
 var smooth = 2.0;
 var DoorOpenAngle = 90.0;
 private var open : boolean;
 private var enter : boolean;
 
 private var defaultRot : Vector3;
 private var openRot : Vector3;
 
 function Start(){
 
 defaultRot = transform.eulerAngles;
 openRot = new Vector3 (defaultRot.x, defaultRot.y + DoorOpenAngle, defaultRot.z);
 }
 
 //Main function
 function Update (){
 
 
 
 if(open){
 //Open door
 transform.eulerAngles = Vector3.Slerp(transform.eulerAngles, openRot, Time.deltaTime * smooth);
 }else{
 //Close door
 transform.eulerAngles = Vector3.Slerp(transform.eulerAngles, defaultRot, Time.deltaTime * smooth);
 }
 
 if( openfinaldoor==true && Input.GetKeyDown("f") && enter){
 
 open = !open;
 }
 }
 
 function OnGUI(){
 
 if(enter && openfinaldoor==true){
 GUI.Label(new Rect(Screen.width/2 - 75, Screen.height - 100, 300, 30), "You found the keys. Press 'F' to open the door.");}
 else if (enter) {GUI.Label (new Rect(Screen.width/2 - 75, Screen.height - 100, 200, 30), "Find 3 keys to open the door.");}
 }
 
 
 
 //Activate the Main function when player is near the door
 function OnTriggerEnter (other : Collider){
 if (other.gameObject.tag == "Player") {
 enter = true;
 }
 }
 
 //Deactivate the Main function when player is go away from door
 function OnTriggerExit (other : Collider){
 if (other.gameObject.tag == "Player") {
 enter = false;
 }
 }

Keycollider.js

 #pragma strict
 
 import UnityEngine.UI;
 import UnityEngine.GUI;
 
 
 public static var keyCounter = 0;
 public var customGuiStyle : GUIStyle; //Gestaltung der GUIBox
 public var openfinaldoor : boolean; 
 function Start () {
 }
 
 function Update () {
 
 if (keyCounter ==3)
 {openfinaldoor=true;}
 else{
 openfinaldoor =false;}
 print(openfinaldoor);
 }
 
 function OnTriggerEnter(collision : Collider){
 
 if (collision.tag=="Key"){
 Destroy(collision.gameObject);
 keyCounter = keyCounter + 1;
 //Debug.Log("Bin drin");
 }
 
 }
 
 function OnGUI(){
 
 GUI.Box(new Rect (Screen.width/2-250,20,50,25), "" + keyCounter,customGuiStyle);
 
 }