I always relied on a click-type ballpoint pen. Unscrew the two pieces and the plastic ink "cartridge" inside is almost the diameter of the keyhole, is sturdy enough to provide good pressure, and certainly reaches far enough in.

"Mariners Fan Catches Foul Ball in Beer, Attempts to Chug, Fails"

Fox-body 5.0 Mustangs. Regardless of what you think of the sound, it's instantly recognizable.