Camera Shake C# Unity3d

using UnityEngine;
using System.Collections;
 
public class CameraShake : MonoBehaviour
{
 public Transform camTransform;
 public float shake = 0f;
 
 public float shakeAmount = 0.7f;
 public float decreaseFactor = 1.0f;
 
 Vector3 originalPos;
 
 void Awake()
 {
  if (camTransform == null)
  {
   camTransform = GetComponent(typeof(Transform)) as Transform;
  }
 }
 
 void OnEnable()
 {
  originalPos = camTransform.localPosition;
 }
 
 void Update()
 {
  if (shake > 0)
  {
   camTransform.localPosition = originalPos + Random.insideUnitSphere * shakeAmount;
   
   shake -= Time.deltaTime * decreaseFactor;
  }
  else
  {
   shake = 0f;
   camTransform.localPosition = originalPos;
  }
 }
}