How do you change a sprite after an amount of time?

Hi, I'm trying to make an object in my game where it's sprite changes once it collides with a certain object, but then changes back to the original sprite after 1-2 seconds. I have the first part, but have no idea how to do the second part. Here's my code so far.

 var spriteImage : Sprite;
 
 function OnCollisionEnter2D(col : Collision2D){
     if(col.gameObject.tag == "Red") {
         GetComponent(SpriteRenderer).sprite = spriteImage;
     }
 }

Thanks in advance.