Problem with holding down UI button to instantiate prefab.

I have a button in my UI that has the following script attached to it.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.EventSystems;
 using UnityEngine.UI;
 
 public class LaserControl : MonoBehaviour,IEventSystemHandler {
     
     public GameObject character;
     bool buttonHeld = false;
     public GameObject laser;
     public float laserSpeed;
     public AudioClip laserShot;
     public float firingSpeed;
         
     public void pressed (BaseEventData eventData)
     {
         buttonHeld = true;
     }
     public void notpressed(BaseEventData eventData)
     {
         buttonHeld = false;
     }
     void Start () 
     {
         character = GameObject.FindWithTag ("Player");
     }
     void Update(){
         if (buttonHeld){
             Debug.Log ("click");
             InvokeRepeating ("shootLaser", 0.001f, firingSpeed);
         }
         else{
             Debug.Log ("not click");
             CancelInvoke("shootLaser");
         }
     }
     void shootLaser() {
         GameObject shot = Instantiate (laser, character.transform.position,Quaternion.identity) as GameObject;
         shot.GetComponent<Rigidbody2D>().velocity = new Vector2 (0f, laserSpeed);
         AudioSource.PlayClipAtPoint (laserShot,transform.position);
     }
 }

The issue I am having is that I am trying to instantiate at a given interval when the button is held. When I push the button right now, I am invoking at a massive rate. I had the same code being initialized Input.GetKey(KeyCode.space) and the timing was perfect. But when I introduce events, it stops working correctly, and goes into overdrive.

This is my first time using the IEventSysemHandler. I am using Pointer Down and Pointer Up as my BaseEventData at Runtime only.

Any help would be great! I am at a loss where to go from here.