Examples? You probably only think you have some because you're over-extrapolating what the proposal really is about. Job Guarantee advocates usually advocate for it within a larger framework that is pretty much the same as we have today.

One of the closest examples of an actual Job Guarantee was the "jefes y jefas de hogar" program in Argentina after the crisis (Google it). It worked pretty well for what it intended; perhaps too well, to the point where it became politically unpopular due to traditional views on gender roles, and was eliminated because of that.