Landing a game object?

Unity Engine
1

Im trying to get it so my game object lands on the ground of my scene, im using a var target2 to get the object to point 0 0 0 on my level, the problem is when i invoke this function, the game object continues to fly forward from its current position, any ideas?

function MoveLand() {
	
	target2 = Vector3(0,0,0);
	shouldLand= true;
	shouldMoveAir = false;
	
   while(shouldLand)
   {
   	     Debug.Log("Move Land"); 	
      	 
	
	
      	//rotate
		var rotation = Quaternion.LookRotation(target2);
    transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * 2);
     
     //move
    transform.position += transform.TransformDirection(Vector3.forward) * Time.deltaTime; 
       
         yield;
         if (transform.position.magnitude <1.1){
         animation.Stop("fly");
   	animation.CrossFade("walk");
   //	shouldMoveLand = true; 
         Debug.Log("close to landing");
      } }}
2

function Update?
and a boolean that activates/deactivates the landing part?