In popular culture, "Open Sesame" is a well-known nonsense incantation that allegedly can be used to open doors or passages. The phrase originates from the story "Ali Baba and the Forty Thieves."
Behind the scenes
Coincidentally, one of the incorrect answers for the question "How does Harry get the locket open?" on the Wizard's Challenge at harrypotter.scholastic.com is the non-existent incantation Abrete Sesamo, which is a Spanish translation of Open Sesame.