If you do try to snap it, work from the inside as most anti-snap cylinders are only effective on the outside face. There’s a reasonable chance you will do some damage to the door, obviously a burglar is not too fussed about this.
If you have plenty of time then drill away, if you have a small grinder cut the face of the the cylinder off as close to the door face first. Careful of sparks on the glass as they tend to stick. Obviously once you start to drill it then you are committed to finishing the job that way.
The other option is to make a bump key, or call a locksmith who should have it out in a matter of seconds but I have no idea of cost.