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Where to drill to remove a cylinder when no keys are available?

To drill a lock cylinder, properly place the drill bit on the face of the cylinder to drill through the tumblers. This can be done with a lock drilling jig or a spring-loaded center punch.  The goal is to place the drill bit above the keyway, near the edge.  start drilling at a moderate speed, spraying lubricant intermittently on the drill bit where it meets the lock cylinder. This is the most important aspect of drilling cylinders. Without a cutting agent (the spray lubricant), there's a good chance the cylinder would heat to the point of melting and welding itself together.
While drilling, you can feel the drill bit cut through the pins that make up the tumbler; usually there are five or six pins. An important point to make here is that moderate force should be applied to the drill so that the drill bit doesn't get jammed or broken; also, excessive force will overheat the bit.
After the pins have been drill, insert a screwdriver into the key slot and turn it to unlock the door.

To successfully drill a lock's cylinder, you will need the following tools:

  • Drill (electric or battery-powered), preferably with a keyless chuck so that you can operate it while wearing gloves.
  • A drill bit—3/16 inch or 7/32 inch offers the best cut because of the size of the tumblers. Anything bigger might catch on the tumblers or shavings, jamming the drill bit; anything smaller might not cut through the tumblers.
  • A spray-on lubricant.
  • A spring-loaded center punch or lock drilling jig.
  • A straight-slot screwdriver small enough to fit in the lock's keyway or a key tool. (A T-handled screwdriver works best because of the added leverage on the handle; you may have to use a bit more force for the initial turn if shavings are lodged in the keyway.)

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