Originally the word "hacker" made no distinction between the two meanings. This site is pretty old, so you're right, it was intended in the original "Kevin Mitnik" sense (the original hacker, who ironically would fall outside of the modern definition)

The modern acception focused on online computer security came much later. That meaning is neither the one used in the name of this site nor the one that would be relevant to this conversation.

To summarize: today's hackers are also yesterday's hackers, but yesterday's hackers may or may not be modern hackers.

Lock picking falls under jargon files definition of "hack" imo

Lockpicking can also be in that colors, AFAIK.

Definition 7 from the Jargon File:

"One who enjoys the intellectual challenge of creatively overcoming or circumventing limitations."