Want to play a sound at the end of my program... Having problem...

Hello,

I want to play a siren sound at the end of my program. When the playback has finished I want to exit the program with the commands: noLoop(); exit();
My siren gets triggered with the letter 'h' on keyboard. If I dont have the noloop and exit commands it works fine, but sadly it does not exit...
here is my code:

1. import ddf.minim.spi.*;
   import ddf.minim.signals.*;
   import ddf.minim.*;
   import ddf.minim.analysis.*;
   import ddf.minim.ugens.*;
   import ddf.minim.effects.*;
   Minim minim;
   AudioSample alert;
   
   boolean hault;
   
   void setup() {
     size(310, 220);
     fill(50);
     textSize(30);
     text("PABLO", 105, 50);
     textSize(20);
     text("Press 'H' to hault Program", 25, 100);
    
     // Sound Output Setup
     minim = new Minim(this);
     alert = minim.loadSample("siren.mp3");
   }
   
   void draw() {
     if (hault == true) {
       alert.trigger();
       hault = false;
       noLoop();
       exit();
     }
   }
   
   void keyPressed() {
     if (key == 'h') {
       hault = true;
     }