unity wait for seconds not working code example

Example 1: wait for seconds unity

//In the example below the script will right "Hello" and 3 seconds later write "Goodbye" in the console
Start()
{
  	//Call the function Example()
	StartCoroutine(Example());
}

Example()
{
  	Debug.Log("Hello");
  	//wait 3 seconds
	yield return new WaitForSeconds(3);
  	Debug.Log("Goodbye");
}

Example 2: unity wait for seconds

void start() => StartCoroutine(MyIEnumerator());

IEnumerator MyIEnumerator()
{
	Debug.Log("Hello world!");
    yield return new WaitForSeconds(3);
    Debug.Log("Goodbye world!");
}