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private void Update()
{
    if (Input.GetKeyUp(KeyCode.LeftArrow))
    {
        StartCoroutine(RotateCamera(pivotPos, pivotPos.forward, 36*5));
    }
    if (Input.GetKeyUp(KeyCode.RightArrow))
    {
        StartCoroutine(RotateCamera(pivotPos, pivotPos.forward, -36*5));
    }
}

IEnumerator RotateCamera(Transform target, Vector3 axis, int angle)
{
    int direction = angle > 0 ? 2 : -2;
    int times= Mathf.Abs(angle);
    for (int i = 0; i < times; i+=2)
    {
        mainCamera.transform.RotateAround(target.position, axis, direction);
        yield return new WaitForEndOfFrame();
    }
}