Trapped in Scheduled Maintenance

I logged into my WordPress blog admin panel this morning to make a new post and noticed that Pinboard, the layout I use, was updated. I went ahead and clicked on the update, ran it, and things seemed to be fine in the dashboard. I clicked back to the original updates page instead of using the link on the sidebar again — my fault — and ran the updates for the three other styles that were new.

Now, my website is showing the dreaded “Briefly unavailable for scheduled maintenance. Check back in a minute.” message. It’s been 10 minutes, and even using the login gets me to that message. What can I do?