How to disable/enable "isTrigger" of a collider component properly in My Script ?

ObstacleController script :

 public class ObstacleController : MonoBehaviour
 {
     public static ObstacleController instance;
 
     [HideInInspector]
     public Collider m_ObstacleCollider;
 
     void Awake()
     {
         if (instance == null) { instance = this; }
     }
 
     // Start is called before the first frame update
     void Start()
     {
         m_ObstacleCollider = GetComponent<Collider>();
     }
 
     public void TriggerObstacle(bool isTriggered)
     {
         m_ObstacleCollider.isTrigger = isTriggered;
     }
 }

This code doesn't work when I call TriggerObstacle(false) :

 m_ObstacleCollider.isTrigger = isTriggered; //DOES'NT WORK