Почему IEnumerator не работает? Что мы можем сделать, чтобы сделать задержку в функции пожарного ружья?

Наша проблема в том, что мы пытаемся сделать задержку в функции FireGun с помощью IEnumerator, но это, похоже, не работает. Вот наш PlayerControllerScript

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
public class PlayerController2 : MonoBehaviour
{
    private Rigidbody2D playerrb;
    private Vector2 moveDirection;
    public float movespeed = 5;
    private Vector2 mousePosition;
    public Camera sceneCamera;
    public WeaponScript weaponscript;
    public int exp = 0;
    public int maxexp = 50;
    public bool newlevel = false;
    public bool gamepause = false;
    public bool doubleshot = false;
    public int life = 1;
    public Image heart;
    public int firegun = 1;
    // Start is called before the first frame update
    void Start()
    {
        playerrb = GetComponent<Rigidbody2D>();
        

    }
    public IEnumerator WaitASecond()
    {
        yield return new WaitForSeconds(1.0f);
        
        // Code to execute after the delay
    }
    // Update is called once per frame
    void Update()
    {
        //if (Input.GetMouseButtonDown(0) && gamepause == false && doubleshot == false) 
        //{
        //    weaponscript.fireGun();
        //}
        //if (Input.GetMouseButtonDown(0) && gamepause == false && doubleshot == true)
        //{
        //    weaponscript.fireDoubleGun();
        //}

        if (Input.GetButton("Fire1"))
        {
              StartCoroutine(WaitASecond());
              weaponscript.fireGun();
              StartCoroutine(WaitASecond());



        }

        if (exp == maxexp)
        {
            newlevel = true;
        }
        if (life == 0)
        {
            SceneManager.LoadScene(2);

        }
        if (life == 2) {
            heart.gameObject.SetActive(true);   
        }
        if (life == 1) {
            heart.gameObject.SetActive(false);

        }
    }
    private void FixedUpdate()
    {
        // Finds if they're pressing any of the moving buttons
        if (gamepause == false) {
            float moveX = Input.GetAxisRaw("Horizontal");
            float moveY = Input.GetAxisRaw("Vertical");
            moveDirection = new Vector2(moveX, moveY).normalized;
            // The mouse position allows the camera to find the mouse and it gives us where it is
            mousePosition = sceneCamera.ScreenToWorldPoint(Input.mousePosition);
            // This causes it to move. The normalized makes it so people won't go faster if they're doing diagonal
            playerrb.velocity = new Vector2(moveDirection.x * movespeed, moveDirection.y * movespeed);
            Vector2 aimDirection = mousePosition - playerrb.position;
            //This makes it so the mouse's angle, and has  the player rotate towards that.
            float aimAngle = Mathf.Atan2(aimDirection.y, aimDirection.x) * Mathf.Rad2Deg;
            playerrb.rotation = aimAngle;

        }

    }
    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (gameObject.CompareTag("Enemy")) {
            Destroy(gameObject);
               

        }
    }
   
}

Вот наш сценарий оружия.

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

public class WeaponScript : MonoBehaviour
{
    public GameObject bullet;
    public Transform firepoint;
    public float fireForce = 10.0f;
    public GameObject player;
    public PlayerController2 playercontroller;
    public void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player");
        playercontroller = player.GetComponent<PlayerController2>();
    }

    public IEnumerator ExecuteAfterTime()
    {
        yield return new WaitForSeconds(1.0f);
        GameObject projectile = Instantiate(bullet, firepoint.position, firepoint.rotation);
       projectile.GetComponent<Rigidbody2D>().AddForce(firepoint.up * fireForce, ForceMode2D.Impulse);
        
    }

    public void fireGun()
    {

        
        StartCoroutine(ExecuteAfterTime());

    }

    public void fireDoubleGun()
    {

        GameObject projectile = Instantiate(bullet, firepoint.position, firepoint.rotation);
        projectile.GetComponent<Rigidbody2D>().AddForce(firepoint.up * fireForce, ForceMode2D.Impulse);
        GameObject projectile2 = Instantiate(bullet, firepoint.position, firepoint.rotation);
        projectile2.GetComponent<Rigidbody2D>().AddForce(firepoint.up * fireForce, ForceMode2D.Impulse);
    }
}

Думаю, основная проблема с кодом где-то здесь, в нашем WeaponScript.

       public IEnumerator ExecuteAfterTime()
    {
        yield return new WaitForSeconds(1.0f);
        GameObject projectile = Instantiate(bullet, firepoint.position, firepoint.rotation);
       projectile.GetComponent<Rigidbody2D>().AddForce(firepoint.up * fireForce, ForceMode2D.Impulse);
        
    }

    public void fireGun()
    {

        
        StartCoroutine(ExecuteAfterTime());

    }

Мы пробовали другие способы задержки срабатывания FireGun, но они тоже не сработали. Проблема сейчас в том, что он продолжает порождать бесконечное количество. Наша цель — создавать пулю каждую секунду.