Anyone who has a bump key can open your door locks. You can buy a bump key online for $3. Search Youbube to see how easy it is to open any lock with a bump key. There is no way to totally secure your house from break-in. I doubt they will try to kick the door in. More likely they will jimmy a window with a simple screwdriver.
Your best option is to install a wireless alarm like Simpli Safe or Piper. No contracts and if you want it monitored it is only $14.95 mo. It comes pre-set so all you do is stick the contacts on the door and place the motion sensors.
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