How do I scale a sprite?

I need help scaling a sprite with C# but i don't know how.
Here is my code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class BossControl : MonoBehaviour
7. {
8. // Start is called before the first frame update
9. void Start()
10. {
11.    
12. }
13.  
14. // Update is called once per frame
15. void Update()
16. {
17.  
18. }
19. }
20.  

Can someone please adjust my code so it waits 0.5 seconds in the start loop and then changes the size from 1 to 2? (On every axis)
Everything i try doesn't work
My sprite i want to change is called "Angry" (a boss form) and it is in a scene called "SampleScene" (default scene name)

 

For a delayed action have a Look at enumerators:

IEnumerator wait()
{
yield return new waitforsceconds(0.5f)
gameObject.transform.localScale = new Vector3(2,2,2);
}

Start the IEnumerator in the start Methode with StartCouroutine(wait());

 

It says "waitforseconds" and "StartCoroutine" can't be found
Why is that happening?
Also where do i define the IEnumerator method?