Unity crashes when executing a script onMouseDown

So I have a green button, that when I press it, the door goes down and closes. Here is my script that is attached to the button.

using UnityEngine; using System.Collections;

public class DoorButtonLeft : MonoBehaviour {

 public GameObject doorleft;

 public float closeSpeed =3f;

 void OnMouseDown ()
 {
     while (doorleft.transform.position.y != 4.322434) 
     {
         doorleft.transform.Translate (Vector3.down * closeSpeed * Time.deltaTime);
     }
 }

}

All it does is crash my unity. Please help.