ButtonEnlarger.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using DG.Tweening;

public class ButtonEnlarger : MonoBehaviour {

    private Button button;
    private Vector3 initialScale;
    public float scaleFactor = 1.2f;
    public float scaleTime = 0.1f;

    private bool isEnabled = true;

    void Awake()
    {
        initialScale = transform.localScale;
        button = GetComponent<Button>();

        EventTrigger trigger = gameObject.AddComponent<EventTrigger>();
        var pointerDown = new EventTrigger.Entry();
        pointerDown.eventID = EventTriggerType.PointerDown;
        pointerDown.callback.AddListener((e) => {
            if (isEnabled && button.interactable && transform.localScale.x > 0.001f)
            {
                DOTween.Kill("buttonScale");
                transform.DOScale(initialScale * scaleFactor, scaleTime).SetId("buttonScale");
            }
        });

        trigger.triggers.Add(pointerDown);
        var pointerUp = new EventTrigger.Entry();
        pointerUp.eventID = EventTriggerType.PointerUp;
        pointerUp.callback.AddListener((e) => {
            if (isEnabled && button.interactable && transform.localScale.x > 0.001f)
            {
                DOTween.Kill("buttonScale");
                transform.DOScale(initialScale, scaleTime).SetId("buttonScale");
            }
        });
        trigger.triggers.Add(pointerUp);
    }

    public void SetEnabled(bool e)
    {
        isEnabled = e;
    }
}