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: customers_seeds.rb
    path of file: ./repos/workarea/core/app/seeds/workarea
    
    the code of the file until where you have to start completion: require 'active_support/testing/time_helpers'

module Workarea
  class CustomersSeeds
    include ActiveSupport::Testing::TimeHelpers

    def perform
      puts 'Adding customers...'

      20.times do |i|
        travel_to rand(12).weeks.ago

        User.create
    
    def perform
      puts 'Adding customers...'

      20.times do |i|
        travel_to rand(12).weeks.ago

        User.create!(
          email: Faker::Internet.email,
          password: Faker::Internet.password,
          first_name: Faker::Name.first_name,
          last_name: Faker::Name.last_name
        )

        travel_back
      end
    end