Try a larger drill bit. You probably haven't gotten everything that is holding the cylinder in place.

It only has to turn about 10 or 20 degrees clockwise to unlock the glass. If you're not there yet I would go to a bigger diameter drill, and keep upsizing until you wipe out enough of the cylinder pins.

Bosch Daredevil bits drill locks out very quickly, they look like a masonry bit but drill wood and metal. Just use a 3/8" bit now on that lock.

Keep stepping up your drill bits, something is still holding it together internally.

just keep increasing the drill size untill the lock gives way..

I've drilled out quite a few in my time in this "hobby" and by far this is the easiest way to accomplish it.
The set may be a bit pricey for some but it's well worth it.
Not positive but I think the set is around $65 at Lowe's.

DRill (resized).jpg

Depending on how much you'll use it, harbor freight has a similar set for around $20 IIRC.

PS Never tried step bits for something like this. Usually get through pretty quickly with decent quality bits.

So as others have said, go bigger. And after that, I carry a large bladed screwdriver in my bag. I hammer that into the lock, and twist with a wrench. The lock just rips its guts out. On some locks, I start there, just need to not rip the wood.

And before that, I've had pretty good luck learning to pick them. They aren't exactly high security. So I'll give it a few minutes to try that first. Sometimes a simple rake attack will get it open fast.

I bought this carbide tipped drill bit and it goes through locks in seconds. Until I bought this I would go through normal 1/4” drill bits quickly.

https://www.amazon.com/gp/aw/d/B004OFVWZ4

I agree on a thicker stronger drill bit.

There aren't many other reasonable options for these really stubborn locks.

health-and-safety-code-12085-making-possessing-or-transporting-explosives (1) (resized).jpg

Well, there's nothing left to turn now. The cylinder and housing are completely gone on that one side.

It looks like you drilled all the way through the back of the cylinder too. Which means the lock cylinder probably isn't attached to the backglass latching mechanism any more.

I think you can stop drilling now.

Can you try lifting the backglass and see if it clears the lower channel now?

If not, you could probably pry the rest of the cylinder out of the housing with a large flat head screwdriver. That might give you enough access to possibly grab the hold bar and try to rotate it. Or, try to stick a flat head screwdriver in the square hole on the hold bar, and then try to rotate.

I think your too far too the one side with the drill bit that's why it's still hanging on if it is ,I would try drilling over a bit where it's still hanging on if you can then it should come apart maybe hope it goes well

The way to drill a backbox lock isn't to go big. Use an 1/8" bit or smaller to drill out only the tumblers. No drilling in the center of the lock. Most backbox locks have two sets of tumblers. Both need to be drilled. Drill, blow out shaving, try to turn with a big standard screwdriver in the slot. If it doesn't turn, keep drilling and blowing until it eventually does turn.

Important to have a sharp bit as it will be cutting different types of metals. You can do it with an older bit, but it will take considerably longer. Use the right (sharp) tool for the job. Doesn't have to be a moon rock bit (expensive), but should be new or newish.

If you were drilling clockwise, there is a good chance you have already rotated the latch far enough to release the glass. Perhaps the glass is just stuck in the channel. Does the glass wiggle or is it tight?

Unfortunately, the drilled hole is way off center to the right from the pic. Chuck up a 1/4" drill bit. As soon as it "bites", put pressure to the left. you need to knock out about 1/4" to the left of the pic, and then use a flat blade screwdriver to move the latch.

Worst case, PM me and I'll buy that game.

Not that it helps with this case, but it's helpful in this hobby to learn the basics of lockpicking. It's faster and cleaner than drilling and has saved me many times.