Since those power bricks aren't supposed to get all that hot (at least, none I've ever felt did), and it's also not working, I expect it's failed and that's why it's so hot.
You could probably let it cool down and try again, since it's theoretically possible it overheated for some other reason and it'll be ok once it cools down, but I think that's highly unlikely. And, I'd be careful with it--if it has shorted internally, it could do something very bad if you keep using it (melt, burn, explode, shoot out sparks, trip the breaker in your house, etc). Certainly don't leave it alone.