The Unlocking Charm (incantation: Alohomora) also known as the Thief's Friend is a charm that opens mechanical locks that are not protected by magic. It is also able to open doors locked by Colloportus.


Although it is unknown who invented it (the spell was created in Africa) it was brought to Britain and hence to the world in the 17th century by Eldon Elsrickle. He used it to terrorise London, stealing from homes of Muggles and wizards alike, until Blagdon Blay invented an Anti-Alohomora Charm.