Animation not working

Hi ,

I am trying to play an animation on third person controller but doesn't seems to work properly , it starts to repeat itself like its in a loop.

Following is what i tried-

 using UnityEngine;
 using System.Collections;
 
 public class AnimationButton : MonoBehaviour {
 
     public GameObject testObject1;
     public GameObject testObject2;
     public AnimationClip frontToBack;
     public bool check = false;
 
     Rect button1Area = new Rect (200, 0, 110, 20);
 
     // Use this for initialization
     void Start () {
         animation["FrontToBack"].wrapMode = WrapMode.Once;
         if(testObject1.active == true){
         testObject2.active = false;
         }
     }
     
     // Update is called once per frame
     void Update () {
         if (check == true) {
             animation.Play ("FrontToBack");
         }
     }
     
     void OnGUI () {
         if (GUI.Button (button1Area, "To Back Door")) {
                         if (testObject1.active == true) {
                         check = true;   
                         }
                 }
         if (animation.IsPlaying ("FrontToBack")) {
                         Debug.Log ("Playing");        
                 }
     }
 }

I understand it will stop once the Boolean value is FALSE but how can i determine the animation has played once ?