Each article is a household note for one key or one lock you already have. It does not cut a key, change a cylinder, or guarantee that a door will open.
Spare Key Hook does not tell you to force a key, to hide a key where a stranger can find it, or to copy a key that the bow says not to copy. It does not recommend a shop. A lock that is your landlord’s, or a key that is not yours to copy, is outside these pages.
A minute or a number of copies marked as an illustrative example is made up so the steps are easy to follow. It is not a test of your lock. If the key in your hand does not match the page, stop and use the key that does.
Doors differ. A note that fits a simple apartment knob can be wrong for a building door, a mailbox, or a padlock. Read the key you are holding.