The type of lock will affect the cost to get into a house. Locks can range from simple turn systems to more complex, high-security systems. Older locks may require a special technique or tool. Some locks are difficult to access because of accumulated rust or a complicated design, like mortise, high-security, or locks with an interchangeable cylinder core lock design. Simple designs like bored cylinder or tubular chassis locks are straightforward to change and therefore cost less. Some more expensive designs are locks with sidebar pins, mortise style, or case locks.