Locks on interior doors didn't become common until the 1950s to 1970s. If you live in a historic St. Louis home, you know all about its quirks. For some, that includes interior doors without locks.

When you think about home security, you probably picture locking your front and back doors before heading to bed. But have you ever considered the importance of locking your interior doors at night?

Locks on interior doors of homes often last for many years without needing replacement, but redecoration or lock problems can make changes necessary. Worn or unsightly finishes, knobs that pull loose ...