[Closed] Open/Close Chest with delay...

Hello! In the scene I have an object(chest) which should be opened by clicking the mouse. (Of course I have all the animations and Box Collider)

But! I need to chest could not be opened and closed to everyone mouse click. Between animations should be delay for 2 seconds. I have a C# script, where a chest can have 3 states (Open, Close and Inbetween). At start chest have state "Close". When i click on it, state chenge to "Inbetween" but then nothing happens although the state must change On "Open".

Script

 using UnityEngine;
 using System.Collections;
 
 public class Chest : MonoBehaviour {
     public enum State {
         open,
         close,
         inbetween
     }
     
     public State state;
 
     // Use this for initialization
     void Start () {
         state = Chest.State.close;
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
     
     public void OnMouseEnter() {
         Debug.Log("Enter");
     }
     
     public void OnMouseExit() {
         Debug.Log("Exit");
     }
     
     public void OnMouseUp() {
         Debug.Log("Up");
         switch(state){
         case State.close:
             state = Chest.State.inbetween;
             StartCoroutine("Open");
             break;
         case State.open:
             state = Chest.State.inbetween;
             StartCoroutine("Close");
             break;
         }
 
         }
     
     private IEnumerable Open() {
         animation.Play("open");
         
         yield return new WaitForSeconds(animation["open"].length);
         
         state = Chest.State.open;
     }
     
     private IEnumerable Close() {
         animation.Play("close");
         yield return new WaitForSeconds(animation["close"].length);
 
         state = Chest.State.close;
 
     }
 }

How can I fix it? Thanks in advance

P.S. Sorry for my english