You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: brute_force_protection.rb
    path of file: ./repos/sorcery/lib/sorcery/model/submodules
    
    the code of the file until where you have to start completion: module Sorcery
  module Model
    module Submodules
      # This module helps protect user accounts by locking them down after too many failed attemps
      # to login were detected.
      # This is the model part of the submodule which provides configuration options and methods
      # for locking and unlocking the user.
      module B
    
          def lock!
            config = sorcery_config
            attributes = {config.lock_expires_at_attribute_name => Time.now.in_time_zone + config.login_lock_time_period,
                          config.unlock_token_attribute_name => TemporaryToken.generate_random_token}
            sorcery_adapter.update_attributes(attributes)

            unless config.unlock_token_mailer_disabled || config.unlock_token_mailer.nil?
              send_unlock_token_email!
            end