void Start()
{
  var testPosition = new Vector3(1,1,1);
  StartCoroutine(SwithPosition(testPosition, 3));
}

IEnumerator SwithPosition(Vector3 pos, float time)
{
  var oldPosition = transform.position;
  transform.position = pos;
  yield return new WaitForSeconds(time);
  transform.position = oldPosition;
}