Average Middle-Aged Man

The Average Middle-Aged Man is a strange man who appears in A Link to the Past. He is a former thief specialized in the picking of locks that now lives under the guise of being a mute ordinary man, making his residence at the entrance of the Desert of Mystery. If Link picks up or slices his sign, the Lockpicker will break his silence and follow Link until he leaves the area.

After hearing about the Lockpicker from a thief in the Lost Woods, Link can return to the man with the chest found in the Village of Outcasts. The man offers to open the chest for Link in exchange for him not telling anyone about his true identity. He gives Link the Magic Bottle that was inside in exchange for Link's silence. Afterwards, he won't care one way or the other whether or not his sign is taken.

Trivia
The Lockpicker asking Link to keep his identity a "secret to everyone" is possibly a reference to the famous quote from The Legend of Zelda.