How do I stop a timer with OnTriggerEnter()?

Hi, I am still new to Unity and have ran into a problem. I am trying to use onTriggerEnter so that the timer could stop once all the blocks have entered a certain area. The blocks have colliders and rigidbodies. I made a script for the onTriggerEnter to be on the area.

Code: using System.Collections; using UnityEngine; public class WinBox : MonoBehaviour { private int count; [SerializeField] Timer timerObj; //to get functions from different script

 void Start()
 {
     count = 0;
 }
 private void OnTriggerEnter(Collider other)
 {
     if(other.gameObject.tag == "Block")
     {
         count++;
     }
     if (count == 16) //number of blocks to be moved
     {
         timerObj.Finish();//to end the timer
     }
 }

}