How do I make a 3sec delay within an OnCollisionEnter2D method?

Questions & Answers
1

In my player movement script I am trying to create an item drop that makes the player invincible for 3 seconds. After 3 seconds i want the player to be able to die again when it collides with an enemy. I have the collision part of it working just fine, but I can’t figure out how to create a 3 second delay within my OnCollisionEnter2D method. Basically, after the player collides with the drop it will set bool canDie to false, making the player invincible to enemies. Then there needs to be the 3 sec delay, followed by setting bool canDie back to true, disabling invincibility. I have looked at Invoking and Coroutines/Wait for seconds but I am not experienced with those aspects and cannot get the delays to work. Any help is appreciated. Thanks.

private bool canDie = true;

void OnCollisionEnter2D(Collision2D col)
	{
		//Collision with enemy 
		if (col.gameObject.tag == "Enemy" & canDie == true) 
		{
			Destroy(gameObject);
			
			//Game over screen
			if (Application.loadedLevel == 1)
			{
				LoadScene(2);
			}
		}

		//Collision with Invincibility Drop
		if (col.gameObject.tag == "Drop1") 
		{
			Debug.Log ("COLLISION WITH DROP");
			canDie = false;					//If player picks up drop, player becomes invincible. After 3 seconds, invincibility is gone.
			//PLACE 3 SECOND DELAY HERE
			canDie = true;
		}
	}
2

You can check out IEnumerator, and StartCoroutine

IEnumerator 3SecondDelay() {
        canDie = false;
        yield return new WaitForSeconds(3);
        canDie = true;
    }

You just add this method to your class, and in your collison method you just call it with "StartCoroutine(3SecondDelay());