Audio In Key Script Not Working

I have created a key and door. The door only opens when the key is obtained by the player. The player has to press "E" to obtain the card. When the player presses "E", I want a sound played. My script isn't working so I was hoping someone could be able to help.

 #pragma strict
 
 var TheKey : GameObject;
 private var playerNextToKey = false;
 var KeySound : GameObject;
 
 function Update () 
 {
      if (Input.GetKeyDown(KeyCode.E) && playerNextToKey == true)
     {
     TheKey.active = false;
     }
 }
 
 function OnTriggerEnter (theCollider : Collider)
 {
     if (theCollider.tag == "Player")
     {
         playerNextToKey = true;
         KeySound.audio.Play();
     }
 }
 
 function OnTriggerExit (theCollider : Collider)
 {
     if (theCollider.tag == "Player")
     {
         playerNextToKey = false;
         KeySound.audio.Play();
     }
 }