Maybe it's because it's homophone to the English word 'lock'? Locked into the past, wanting to lock someone into the world of the living, something like that.

[ She has no idea why she's spit-balling about the meaning of a video game she'd never heard of now, but that's how the day is going. ]

Though that would be a disappointing solution. Evoking meaning from philosophers who a large part of the game's audience won't even know much about... that's a lot more fascinating.