Most of the customers that I served were locked out for one reason: locked the key inside of the house by locking the door knob. To avoid this case , I recommend to have a keypad lock installed. This way you don’t need a key to carry with you in order to get in to your house.
Stiff handle or knob
Another reason that you can be locked out is that the knob or dead bolt lock start to act not normal (become stiff). I recommend to have the lock to be changed asap.
Having too many keys to different locks in your house
Many customers worry that if they will have one key that operate all locks, it will make the house less secure. This is NOT true. The security of the house depends on the lock quality and security (the number of pins and the size of pins inside of the lock, etc.)