The door lock is the most common type of lock. It is used by everyone from a store owner to a house owner or even a simple storage unit. Door locks are also popular due to the fact they are cheap to buy and very easy to replace. While at the same time providing simple security against many forms of break-ins. They are commonly placed in newly built houses as opposed to the more expensive deadbolt locks. Since they are cheap, easy to install, and even easier to replace, it is no wonder why a lot of house builders prefer the simple door lock.

There are many common problems with the simple door lock. Take for instance the simplicity of design. Because of the affordability of the locks, many locksmiths state that they cannot make them as secure and complex as they would like them to be. If they did end up making them as complex and hard to get into as they would like; the cost would be far too high. This is, of course, simply so that the consumer can afford to buy the locks in the first place. This is one of the common problems with them, they're not as complex as they could be (and in some cases should be) in order to withstand many different types of crime. In fact the common bored cylindrical lock can be nothing but a mere annoyance to a skilled and determined burglar.

Another common issue with door locks is the fact they offer very little security against more simple attempts to unlock them. In some cases burglars have just cut a small hole in the door (quietly) and unlocked it just by twisting certain mechanisms. Or when the door proved too tough to get through in a quiet manner they resorted to the old fashioned method of picking the lock. More often than not a burglar that knows what he is doing will end up unlocking it and gaining free range of the house, store, or other establishment. This is due to the simple design by which a door lock is constructed. Another common issue is that door locks have a tendency to break or rust under certain conditions whereas other types of locks would function fine. The materials that most companies use to design the simple door lock are fairly inexpensive and easy to use. This is why they are so cheap, and why consumers are so eager to buy them in order to prevent extra spending.