Move camera on the z axis forward and backward with coroutine

Hi, I'm making a simulation of a desktop in a 3d space, and I need to move the main camera along the z axis forward when I am over a 3d icon and backward when I left the icon with the mouse. Here is my code but the coroutines can't work together in the way I need:

     IEnumerator Zoom (float zPos, float delay)
     {
         yield return new WaitForSeconds (delay);
 
         float elapsedTime = 0.0f;
 
         while (elapsedTime < 2.0f) {
             elapsedTime += Time.deltaTime;
             Camera.main.GetComponent<FreeMovement> ().zPos = Mathf.Lerp (Camera.main.transform.position.z, zPos, elapsedTime / 2.0f);
             yield return null;
         }
     }

And I call the coroutine here:

 void OnMouseEnter ()
 {
     StartCoroutine (Zoom (50.0f, 0.0f));
 }

 void OnMouseExit ()
 {
     StartCoroutine (Zoom (0.0f, 2.0f));
 }

The script is attached to every icon in the space, the zPos is controlled over the FreeMovement script attached to the main camera.

The result is that zooming in is ok but zooming out takes place for the next zoom in. I've tried to add a delay but what I really need is a coroutine that results in zooming in while mouse enter and zooming out from the last position on mouse exit towards 0 without jumps. Is it possible?