There are good locks and bad locks. Most locks on today's homes are
not very good. Most burglers defeat locks by forcing a door open, and
rarely do they spend any time trying to pick a lock. More recently, a
technique know as "lock bumping" has become widely known, allowing
even an unskilled burglard to easily open the inexpensive locks one
buys at hardware store. If you bought a new home, the builder most
likely installed cheap locks, and you really should consider upgrading
to better locks like the Schlage Primus or Medeco series.
Good locks don't do much without similarly improving your door
hardware. Avoid having your door kicked in by making sure that the
lock is set into a frame with enough metal to keep the deadbolt from
breaking through the edge of the frame. Ensure that the screws go deep
enough into the door frame and that the door hinges are not exposed on
the outside. Make sure that your doors and windows can not be lifted
off their tracks from the outside.