I secured all of my doors - best locks money could buy. D$&m thieves hacked through the steel siding (26 gauge commercial grade sheet metal). The first time - the alarm went off. They hi tailed it. A year later, happened again. Someone forgot to set the alarm (cough..young son...grrr). Stole a nice four wheeler (cough...young son left key in ignition...grrr), and a bunch of tools. What really ticked me off - they used my two wheeled wheel barrow to haul the loot to the road - then took it! (man, I loved that wheel barrow).
Like has been said. A lock only keeps the honest guys honest. If they want in, they are gonna get in.
Dean