raycast unity color

Question

raycastを飛ばして
当たったオブジェクトの色を変え、2秒程度したら元の色に戻すという処理を実装したいのですが2秒とどめてまたもとに戻すという処理がどのように書けばいいかわかりません。
解決策などあるでしょうか？

public void OnColliderTouchedtouch(){


		if (Input.GetMouseButtonDown(0)){
			Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);	
			RaycastHit hit;

			try{


			if (Physics.Raycast (ray, out hit, Mathf.Infinity, mask)) {
				

				switch (hit.collider.name) {

				case "actionButton0":

					hit.collider.GetComponent<MeshRenderer> ().material.color = Color.yellow;

					

					gamemadefaultMaterial[0] =  hit.collider.gameObject ;
					

					break;

				case "actionButton1":

					hit.collider.GetComponent<MeshRenderer> ().material.color = Color.blue;
					gamemadefaultMaterial[1] =  hit.collider.gameObject ;
					break;

				case "actionButton2":

					hit.collider.GetComponent<MeshRenderer> ().material.color = Color.yellow;
					gamemadefaultMaterial[2] =  hit.collider.gameObject ;
					
					break;
				}


			} 
			}catch(NullReferenceException e){

			}

		}else {

			try{

			gamemadefaultMaterial[0].GetComponent<MeshRenderer> ().material.color = Color.blue;
			gamemadefaultMaterial[1].GetComponent<MeshRenderer> ().material.color = Color.blue;
			gamemadefaultMaterial[2].GetComponent<MeshRenderer> ().material.color = Color.blue;

			}catch(NullReferenceException ex){

			}
		}

	}

　変更後

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
public class vbScript : MonoBehaviour{
	
	GameObject[] virtualButtonObject = new GameObject[3];
	GameObject[] _3Dtext = new GameObject[3];
	public TextMesh[] _3DtextInstance = new TextMesh[3];
	Renderer[] virtualButtonMaterial = new Renderer[3];
	int mask = 1 << 8;
	public sample sampleClass;
	GameObject[] gamemadefaultMaterial = new GameObject[3];
	public static int timeSchedulleCount =1 ;
	int colorFlag ;
	void Start () {
		
		_3DtextInstance [0].text = "1";
		StartCoroutine ("colorWait");
	}

	// Update is called once per frame
	void Update () {

		OnColliderTouchedtouch ();

	}

	public IEnumerator colorWait(){
		yield return new WaitForSeconds (2.0f);
		try{
		switch (colorFlag){
		case 0:

			gamemadefaultMaterial [0].GetComponent<MeshRenderer> ().material.color = Color.blue;

				break;
		case 1 :

			gamemadefaultMaterial[1].GetComponent<MeshRenderer> ().material.color = Color.blue;

				break;

		case 2 :
	gamemadefaultMaterial[2].GetComponent<MeshRenderer> ().material.color = Color.blue;
			break ;

		}

		}catch(NullReferenceException ex){
		}
	}
	public void OnColliderTouchedtouch(){
		if (Input.GetMouseButtonDown(0)){
			Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);	
			RaycastHit hit;

			try{

			if (Physics.Raycast (ray, out hit, Mathf.Infinity, mask)) {
				

				switch (hit.collider.name) {

				case "actionButton0":

					hit.collider.GetComponent<MeshRenderer> ().material.color = Color.yellow;
					
					if (timeSchedulleCount < 6)
						timeSchedulleCount++;

					_3DtextInstance [0].text = timeSchedulleCount + "";

					gamemadefaultMaterial[0] =  hit.collider.gameObject ;
					
					colorFlag =0 ;

						colorWait() ;

					break;

				case "actionButton1":

						hit.collider.GetComponent<MeshRenderer> ().material.color = Color.yellow ;
					gamemadefaultMaterial[1] =  hit.collider.gameObject ;
						colorFlag =1 ;

						colorWait();
					break;

				case "actionButton2":

					hit.collider.GetComponent<MeshRenderer> ().material.color = Color.yellow;
					gamemadefaultMaterial[2] =  hit.collider.gameObject ;
					if (timeSchedulleCount > 1)
						timeSchedulleCount--;

					_3DtextInstance [0].text = timeSchedulleCount + "";

					colorFlag =2 ;

						colorWait();
					break;
				}
			} 
			}catch(NullReferenceException e){

			}

		}else {

			try{

			}catch(NullReferenceException ex){

			}
		}

	}
}