App store

What do you mean by locked out?

If you see a message that says "Your account has been disabled in the App Store and iTunes", there may be a problem with the payment method that you have on file.

When you see the message, don't try to edit any of your account information. Instead, contact Apple Support for help.

Source: If you see a message that says “Your account has been disabled in the App Store and iTunes” – Apple Support

OR if you can't connect to the App Store go here

You can do nothing to correct this, other than to contact Apple Support directly, and to then resolve whatever has arisen here.

Officially: If you see a message that says your account has been disabled in the App Store and iTunes Store, contact Apple Support for help. 

That blue-text link is your starting point.