Actually, for a player who currently plays on an APAC server, there is no effect. You can still play your current characters and even make new ones! What the lock does is stop players who do not have characters on APAC servers at all, from making new ones.
Again, if you're an APAC player who plays on an APAC server, this has no effect on your ability to play.
Is there a certain level you must be, I've tried logging on to Gav Daragon where I have extremely low leveled toons. < 10 and it wont allow me to.