Changing Missile Speed

Ok, so i'm making a game, and I have missiles. For some developer cheats I want it when you press 'q' and 'e' together it changes the speed to something higher, but when I press it the speed doesn't change... Here's the code:

 var projectile : Rigidbody;
 var speed = 20;
 var dev : boolean = false;
  
 function Update () {
     if (Input.GetKey('q')) {
         if (Input.GetKey('e')) {
             Switch(dev);
         }
     }
     if (dev == true) {
         speed = 300;
     }
     else if (dev == false) {
         speed = 135;
     }
     // Put this in your update function
     if (Input.GetButtonDown("FireCar2")) {
  
     // Instantiate the projectile at the position and rotation of this transform
     var clone : Rigidbody;
     clone = Instantiate(projectile, transform.position, transform.rotation);
  
     // Give the cloned object an initial velocity along the current
     // object's Z axis
     clone.velocity = transform.TransformDirection (Vector3.forward * speed);
     }
 }
 
 function Switch (bool){
     if( bool == false) {
         bool = true;
     }
     else {
         bool = false;
     }
     return bool;
 }

Any help would be appreciated!