Scale with coroutine and lerp

Questions & Answers
1

Hi guys, my code is not working, surely a dumb mistake but i can’t found it. The scripts scale bigger a game object and then return to his sclae, using Vector3.lerp.
The first part works good : Fade in (I know it’s not a correct name for this function)
and for the FadeOut i’ve just invert the script but i think i’m missing something.
if anyone can tell me what’s the problem, here’s the code :

   IEnumerator FadeIn(GameObject obj)
    {
        float progress = 0;

        while (progress <= 1)
        {
            obj.transform.localScale = Vector3.Lerp(startPos, endPos, progress);
            progress += Time.deltaTime;
            yield return null;
        }
        StartCoroutine(FadeOut(obj));
    }

    IEnumerator FadeOut(GameObject obj)
    {
        float progress = 1;
        
        while (progress >= 0)
        {
            obj.transform.localScale = Vector3.Lerp(obj.transform.localScale, startPos, progress);
            progress -= Time.deltaTime;
            yield return null;
        }
    }
2

IEnumerator ScaleUpAndDown(Transform transform, Vector3 upScale, float duration)
{
Vector3 initialScale = transform.localScale;

     for(float time = 0 ; time < duration * 2 ; time += Time.deltaTime)
     {
         float progress = Mathf.PingPong(time, duration) / duration;
         transform.localScale = Vector3.Lerp(initialScale, upScale, progress);
         yield return null;
     }
     transform.localScale = initialScale;
 }

// ...

StartCoroutine(ScaleUpAndDown(otherObject.transform, new Vector3(2f, 2f, 2f), 1f);