LookAtObject Unity

using UnityEngine;

 public class LaserLook : MonoBehaviour
 {
     public float rotationDamping;
     public float objectDistance;
     public GameObject[] target;

     GameObject FindClosestAsteroid()
     {
         target = GameObject.FindGameObjectsWithTag("Asteroid");
         GameObject closestTarget = null;
         var distance = Mathf.Infinity;
         var position = transform.position;
         foreach (GameObject go in target)
         {
             Vector3 distanceDiff = go.transform.position - position;
             float curDistance = distanceDiff.sqrMagnitude;
             if (curDistance < distance)
             {
                 closestTarget = go;
                 distance = curDistance;
             }
         }
         return closestTarget;
     }

     void Update()
     {
         var distanceFromTarget = Vector3.Distance(transform.position, FindClosestAsteroid().transform.position);
         if (objectDistance > distanceFromTarget)
         {
             RotateLaser();
         }
         else {
             RotateLaserDefault();   //Reset Laser position to zero
         }
     }

     void RotateLaser()
     {
             Quaternion rotation = Quaternion.LookRotation(FindClosestAsteroid().transform.position - transform.position);
             transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * rotationDamping);
     }
     void RotateLaserDefault() {
         transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.identity, Time.deltaTime * rotationDamping);
     }
 }