other

• sillcock key, used to open tamper-resistant water faucets
• elevator drop keys, AKA hoistway door unlocking devices [1] [2] [3]
• Most heavy construction equipment (e.g. bulldozers, excavators) use a universal key across all models, and sets of these keys are easily bought online.
• Knox Box
  • What is a Knox Box?
  • how to surreptitiously access a Knox Box [1] [2] [3]
  • Knox boxes are typically fitted with a Medeco Biaxial or Medeco M3 high-security core. [1]