This must be something not well known perhaps.
A friend told me to put a tiny allen wrench into the small hole in the center while trying to spin the cylinder on the opposite side. I found that if I put it in the latched position while putting presser on the allen wrench it eventually let me unscrew the cylinder to remove. I then installed it onto the glove box I am using also in the latched position. I dont know what combination you would use with a locking cylinder. It was a little aggravating trying to figure it out even with the destroyed cylinder I was replacing to look at, it was less than obvious. Something this simple ran me a little hard, I almost changed the whole glove box instead.