secret code to open door with sound emission

Hello everybody . I thank everyone in advance for your help. I a building set that there are many doors which open upon entering a secret code . So far my script is working fine , but I would like to open the door was delivered audio , see I put the sound to play when the last character of the code is entered, but the sound is playing on a loop , like that sound stop when the door was wide open , whether or not to enter the trigger , as it stands is ireal , maybe a timer with the command to stop the emission of sound, but do not know how to do that Someone would have a solution for this. thank you

My script:

 var close = false;
 var CodigoBau : String = "";
 var stringToEdit : String;
 //var estiloAviso = GUIStyle;  
 
 var AngleX : float = 0.0;
 var AngleY : float = 0.0;
 var AngleZ : float = 0.0;
 
 private var targetValue : float = 0.0;
 private var valorAtual : float = 0.0;
 private var easing : float = 0.05;
 
 var Sound:AudioClip;
 
 var Target : GameObject;
 
 function SetTheGUI () {
     close = true;
     //targetValue = AngleX;
     //valorAtual = 0.0;
 }
 
 function UnSetGUI () {
     close = false;
 
 }
 
 function OnGUI(){
 if (close){
     GUI.Box (Rect(Screen.width/2-60, Screen.height/2-80, 150, 35),"DIGITE O CÓDIGO");
     
     stringToEdit = GUI.TextField (Rect(Screen.width/2-60, Screen.height/2-40, 150, 25),stringToEdit, 11);
 
     
    if(stringToEdit == CodigoBau){
    
     audio.PlayOneShot(Sound);
     valorAtual = valorAtual + (targetValue - valorAtual) * easing;
      
     Target.transform.rotation = Quaternion.identity;
     Target.transform.Rotate (0 , 0, valorAtual);
     
     
 } 
       
 }
 
 }