How do you quit during hero selection?

Yes, I know it gives me a 5-minute penalty before I can try to join another lobby, and that it's a horrible unsportsmanlike thing to do.

But the only way I can figure out how to do it is to close the entire application and re-launch. Is there no better way to quit a lobby than this?

(I'm trying to play with a friend and the chat system is down, so every 5 minutes we're joining at the same time in hopes that we get lucky...)

The only way to quit champion selection is to close the game. The idea of a queue dodging button has been brought up many times on the forums, and has been shut down by Riot because they don't want people to queue dodge so it's not gonna change any time soon.

Do note that the time penalty for queue dodging goes up if you do it repeatedly in a single day. The time penalties for dodging a Ranked game are also significantly more severe.