How do I stop my weapon from firing while reloading?

there is a bug to my script that if I spam clicks, my weapon can still fire while reloading any help? or anything I can do to fix this?

my Code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Shotgunscript : MonoBehaviour
 {
     public int damage = 50;
     public int ammoleft = 1;
     private int maxammo = 1;
     private float realoadtime = 2f;
     private bool isReloading = false;
     private bool readytofire = true;
     public float range = 100f;
     public Camera Camera;
     public ParticleSystem muzzleflash;
 
 
     private void Start()
     {
         ammoleft = maxammo;
     }
     private void Update()
     {
         if (Input.GetButtonDown("Fire1") && readytofire == true)
         {
             shoot(); 
         }
 
         if(ammoleft <= 0)
         {
             StartCoroutine(Reload());
             return;
         }
 
         if (isReloading)
         {
             return;
         }
     }
 
     private void shoot()
     {
         RaycastHit hit;
         RaycastHit hit_1;
         RaycastHit hit_2;
         RaycastHit hit_3;
 
         ammoleft--;
         muzzleflash.Play();
         if (Physics.Raycast(Camera.transform.position, Camera.transform.forward,out hit, range))
         {
             Debug.Log(hit.transform.name);
             muzzleflash.Play();
         }
 
         if (Physics.Raycast(Camera.transform.position, Camera.transform.forward, out hit_1, range))
         {
             Debug.Log(hit_1.transform.name);
             muzzleflash.Play();
         }
 
         if (Physics.Raycast(Camera.transform.position, Camera.transform.forward, out hit_2, range))
         {
             Debug.Log(hit_2.transform.name);
             muzzleflash.Play();
         }
 
         if (Physics.Raycast(Camera.transform.position, Camera.transform.forward, out hit_3, range))
         {
             Debug.Log(hit_3.transform.name);
             muzzleflash.Play();
         }
         readytofire = false;
              
     }
 
     private IEnumerator Reload()
     {
         isReloading = true;
         Debug.Log("Reloading");
 
         yield return new WaitForSeconds(realoadtime);
 
         ammoleft = maxammo;
         readytofire = true;
         Debug.Log("reloaded_finshed");
         isReloading = false;
     }
 
 }