Here we kneel out of free will. In front of God it will not be optional, but every knee will bow simply because of who Jesus is. It will not be forced by anything external, but your spirit will kneel, if not fall flat on your face, as it will be the only thing it can do.
That’s mainly how it works, when there is no other option and we as a last resort call out to Him and He answers. Unfortunately this is what it takes for most of us.