Workflow module blocked my admin user
Use below Drush command to reset admin password.

&gt; drush uli
    (or)
&gt; drush uli user_name

// Display a one time login link for the given user account (defaults to uid 1).


Just copy the one time login link and paste it your browser. Here you will get reset password option.

After successfully login, disbale the workflow module and go ahead.

More about Drush.