You can't pick s lock with the key in the other end of the cylinder, I can pick locks... Part of my job.
If you leave the keys in the back of the cylinder it's easy to break the glass at the lick and make a hand size hole reach in and unlock, pinch all your stuff and leave via the door
So leave the keys elsewhere, as for removing the glazing beads, if they are on the outside the door and window fitters are mongs.