As far as I know, nothing can be done about your safety lock while it's still active.*
You'll just have to live with it, or restart on another account (which would be kinda dumb).
In any case.. To reset it yourself:
You need to keep your account logged in for the duration of the lock.
[In that time, you may switch characters, just not log out of the account]
Once your safety lock has been deactivated, you need to go in and change the amount of time it's set to.
Unfortunately, the change will not take effect for something like 3 days.
So until then, you're pretty much stuck.
*Edit: And by nothing, I mean GMs can't intervene and change it for you before the 72 hour waiting period.