How to close the game fast, circumventing the ''are you sure'' 5 second timer?

alt + f4 doesn't work. I've been having weird issues lately where I randomly disconnect (only league of legends is affected, my internet is fine) and the only fix is restarting the game. As we know, the ''attempting to reconnect'' message is false, never in my life has it actually reconnected me, I always have to do it myself. Currently this means that as soon as I notice I disconnected, I need to wait an additional 5 seconds to close the game. Which means an additional 5 seconds afk which can me a world of difference in league.
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