How to block a specific user from logging in?
To do this, you can use WPJobster User Ban plugin.
A workaround solution, without using the plugin:
- Go to your WP Admin Dashboard.
- Click on “Users”.
- Select the specific user and press the “Edit” button.
- Change user's email.
- Click on “Generate Password”.
- Click on “Update User” button (bottom of the page).