How can a Coke machine be unlocked?

It's usually done with a key, but you may be looking for an alternative. The round keys used on vending machines provide an increased level of security; they are much more tamper resistant than "straight" keyways. Even a locksmith must resort to "master keys" to get them open if all else fails. Please be smart about your choices for recreational activities. Sometimes a bad choice follows a person around for the rest of his life....