private IEnumerator Eating()
    {
        float eatingTime = Random.Range(customerData.minimumEatingTime, customerData.maximumEatingTime);

        yield return(new WaitForSeconds(eatingTime));

        CurrentState = CustomerState.FinishedEating;
        usingObject.Unuse(gameObject);
        usingObject = null;

        animator.SetBool("isEating", false);
    }