How do i Clone a gameObject when pressing "F"?

here is my script but it doesnt work xD

    var Player : Transform;
    var EnemyModel : Transform;

    function Update()
    {
   transform.LookAt(Player);
   transform.Translate(Vector3.forward * 0.1);
     if(Input.GetKeyDown("F"))
     {
           Instantiate(EnemyModel, Player.transform.position, transform.rotation);
      }

    }

Thanks!

change if(Input.GetKeyDown(“F”)) to if(Input.GetKeyDown(“f”))

Unity recommends GetButton or GetAxes over GetKeyDown. Make sure your axes are defined in the Input Manager.

http://unity3d.com/support/documentation/ScriptReference/Input.GetKeyDown.html