Extension methods to execute an action after a specified delay.

MonoBehaviourExtensions.cs

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using System;
using System.Collections;
using System.Collections.Generic;

public static class MonoBehaviourExtensions
{
    public static Coroutine DelayedAction(this MonoBehaviour m, float delay, System.Action action)
    {
       return m.StartCoroutine(DelayedActionCoroutine(delay, action));
    }

    public static IEnumerator DelayedActionCoroutine(float delay, System.Action action)
    {
        yield return new WaitForSeconds(delay);
        action.Invoke();
    }
}