If you have moved into a very old house and find that you have an old door that is locked, your first thought is probably, "That is weird. Maybe we should leave it locked". Your second thought will probably drift toward insatiable curiosity, and not having a key, you will need a locksmith's help to get the door unlocked. This is how a locksmith works his or her magic on a very old door that no longer has a key.
Removing the Hinges
If the hinges on this old door are exposed on the outside of the door, the locksmith may just remove the door this way. Old doors often had (and still have) pin bolt hinges. When you pull the pin bolts up and out of the hinges, the hinges come apart and you are able to remove the door rather than try and pick the lock. Sometimes the hinges are painted and stuck fast or badly rusted or corroded. Some anti-rust lubricant spray can help release the pin bolts enough to hammer them up and out. A utility knife might scrape away enough paint to pull the bolts free, otherwise paint thinner will remove the paint and free up the bolts.
Picking the Lock
Old locks often require a skeleton key, but that complicates the modern lock picking process because of the way the internal tumblers in these locks worked. Without the key, picking this type of lock is exceedingly tricky, but not impossible. The locksmith has to
Making a New Key
If picking the lock does not work, and the