The video below shows a few kids breaking into a house just before new years. Not a lot of technical expertise here. Give it a watch, and you’ll see a team of young burglars tackle a residential burlgary on a Saturday night at about 8:30pm.
This looks to be a fairly typical B&E, they ring the doorbell repeatedly and peer in the windows to make sure the occupants are not simply ignoring their efforts. The last thing these guys want is to run into a homeowner. An alarm system would likely not have prevented the burglary, but it would have certainly reduced the kids time on the ground inside the house.