After updating the game, I clicked play and saw that the shard select screen was up but all the areas were locked. I can't access my character select screen because I can't select the shard for it. Is this happening with everyone's account?
Yes. This always happens when there is maintenance or an update. The shards go down, they get maintained and/or updated, and then they come back up in a locked state so that Trion can make do some testing on the servers to make sure the updates were applied properly and things are running "as intended." Once all of that is done, then Trion unlocks the servers and players can start logging on.