How would I restart a scene by clicking on something?

So in my game I want to be able to restart by clicking twice within one second on a certain box, if they only click once than nothing happens, but when I try to implement this I get all sorts of errors about where to put what. Can someone explain what I am to do?

Here is the code I have so far

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class Restart_Level : MonoBehaviour
{

public float timeleft;
float timeLeft = 1.0f;
private bool Confirm;
public int Save;

private void OnTriggerEnter(Collider other)
{
    {
        Confirm = true;
        Save = Save + 1;
        yield return new WaitForSeconds(1);
        if (Confirm == true)
        {
            SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
        }
        if (Save == 1)
        {
            Confirm = false;
            Save = 0;
        }
    }
}

}

I’m not sure if you mean a physical 3d box or a UI box, but for a 3d box, you could do something like

public class ReloadScene : MonoBehaviour {

	float lastClickTime = 0f;

	void OnMouseDown (){

		// If the time passed since this object was last click is less than 1 ...
		if(Time.time - lastClickTime < 1 && Time.time > 1){

			// ... reload the scene
			SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
		}

		lastClickTime = Time.time;
	}
}

This may also work for a UI element, but I’m not sure.

Also, note that this won’t work properly within the 1st second of playing the game (Nothing will happen when you double click).

Hope this helped!