If you installed or updated a plugin and your website is unavailable for a long time with the message “Briefly unavailable for scheduled maintenance. Check back in a minute.” then something went wrong. It is stuck in the maintenance mode but don’t worry, the fix is easy and fast. Open the file manager or go with your FTP to the root directory and you will find a .maintenance file. If you delete it your website will come back to normal. I told you that it is easy and fast! If you have, or had, more issues with your WordPress then contact me to post it and help others that might have the same issue.
Note: After deleting the file and visit your website WordPress might tell you that you need to update your database. Click to update it and you are done.