Locked door and key to open it script

I got a key and a door. The door is locked and should be opened only when you found the key.

this is the code I got for the key and the door. (2 separate codes)

 //Door script
 
 private var open : boolean = false;
 
 var openDoorAnimationString : String;
 var closeDoorAnimationString : String;
 
 var buttonTransform : Transform;
 var distToOpen : float = 6;
 
 private var playerTransform : Transform;
 private var cameraTransform : Transform;
 
 var openDoorSound : AudioClip;
 var closeDoorSound : AudioClip;
 
 function Awake () {
     playerTransform = GameObject.FindWithTag("Player").transform;
     cameraTransform = GameObject.FindWithTag("MainCamera").transform;
     if(open)
         animation.Play(openDoorAnimationString);
 }
 
 function Update () {
     var alreadyChecked : boolean = false;
     if (Vector3.Distance(playerTransform.position, buttonTransform.position)<= distToOpen)
     if (Input.GetKeyDown("e") && !animation.isPlaying)
     {
         if(open)
         {
         animation.Play(closeDoorAnimationString);
         open = false;
         alreadyChecked = true;
         if(closeDoorSound)
             audio.PlayOneShot(closeDoorSound);
         }
         if(!open && !alreadyChecked)
         {
         animation.Play(openDoorAnimationString);
         open = true;
         if(openDoorSound)
             audio.playOneShot(openDoorSound);
         }
     }
 }
 
 
 
 
 
 
 
 
 //Key Script
 #pragma strict
 private var open : boolean = false;
 
 var pickupSound :AudioClip ; //when picking up the key the sound
 var audioPos :Vector3 ;
 
 var liftKeyAnimationString : String;  
 var lowerKeyAnimationString : String;
 
 var buttonTranform : Transform;
 var distToOpen : float = 6;
 
 private var playerTransform : Transform;
 private var cameraTransform : Transform;
 
 function Awake ()
 {
     playerTransform = GameObject.FindWithTag("Player").transform;
     cameraTransform = GameObject.FindWithTag("MainCamera").transform;
     if(open)
         animation.Play(liftKeyAnimationString);
     
 }
 
 function OnTriggerEnter(Collider)
 {
     AudioSource.PlayClipAtPoint(pickupSound, audioPos);
     Destroy(gameObject);
     print("You got the Key");
 }
 
 function Update () 
 {
     var alreadyChecked : boolean = false;
     if (Vector3.Distance(playerTransform.position, buttonTranform.position)<= distToOpen)
     if (Input.GetKeyDown("e") && !animation.isPlaying)
     {
         if(open)
         {
             animation.Play(lowerKeyAnimationString);
             open = false;
             alreadyChecked = true;
         }
         if(!open && !alreadyChecked)
         {
             animation.Play(liftKeyAnimationString);
             open = true;
         }
     }
     transform.Rotate(0, 50 * Time.deltaTime, 0);
 }