Line render collsion??

So i have a grapple hook in my game i want to have a level where you can pull the wall down (deleting so the object) and the grapple hook uses a line render and since i am really dumb none of the script i have make work could anyone please help me. also i think Ray Cast would work but i don’t really know.

Here is my latest kinda working script it just deletes right away (due to Update)

 using UnityEngine;
using System.Collections;
public class BreakWall : MonoBehaviour {
private LineRenderer lr;
    void Start()
    {
     
        lr = GetComponent<LineRenderer>();
    }



    void Update() // consider void FixedUpdate()
    {
      RaycastHit hit;
      Destroy(gameObject);
      
    }
}

Duplicate post. Answered here: Line render Trigger? - Unity Engine - Unity Discussions