Trying to make a simple wait for Space coroutine

Unity Engine
1

All I want to do is press space to run a function and then have it wait for space to be pressed again to continue. When I hit space I instantly see Waiting and Waited in the debug. It never waits. I saw lots of posts showing while loops in the IEnumerator but another post showing the yield return line I have there. Do I have to have a while loop or do I have something else wrong?

if (Input.GetKeyDown(KeyCode.Space))
            {
                RevealAnswers();
                StartCoroutine(WaitForSpace());
            }

IEnumerator WaitForSpace()
    {
        Debug.Log("Waiting");
        yield return new WaitUntil(() => Input.GetKeyDown(KeyCode.Space));
        Debug.Log("Waited");
    }
2

It returns true instantly because, when it gets run the first frame, Space is still being pressed, because it first gets evaluated in the same frame.

Try adding a single frame yield (yield return 0;) before the WaitUntil starts, that may fix it.

3

Thanks! I knew it had to be something simple.