TimeScale = 0 dosent work with this scirpt.

Hello everyone I am kinda newibe on unity (and my english is not the best for a heads up).

Any way i use this script: #pragma strict

 var newSprites : Sprite[];
 
 var index : int;
 
 var animationSpeed : float = 0.05;
 
 //var timeScaling : float = 1;
 
 var lastTime : float;
 
 
 function Update()
 
 {
 
     //Time.timeScale = timeScaling;
 
     changeSprite();
 
 }
 
 
 
 function changeSprite()
 
 {
 
     GetComponent(SpriteRenderer).sprite = newSprites[index];
 
     if(Time.realtimeSinceStartup > lastTime + animationSpeed)
 
     {
 
         index++;
 
         index = index % newSprites.Length;
 
         lastTime = Time.realtimeSinceStartup;
 
     }
 
 }
 

i use this script to run my sprites animation. and in the game when you prees on the pause button the timescale = 0 and everything stops beside the sprites animaions.. any idea how do i fix it? Thanks!