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: worker_role.rb
    path of file: ./repos/postal/app/models
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# == Schema Information
#
# Table name: worker_
    
    def acquire(role)
      # update our existing lock if we already have one
      updates = where(role: role, worker: Postal.locker_name).update_all(acquired_at: Time.current)
      return :renewed if updates.positive?

      # attempt to steal a role from another worker
      updates = where(role: role).where("acquired_at is null OR acquired_at < ?", 5.minutes.ago)
                                 .update_all(acquired_at: Time.current, worker: Postal.locker_name)
      return :stolen if updates.positive?

      # attempt to create a new role for this worker
      begin
        create!(role: role, worker: Postal.locker_name, acquired_at: Time.current)
        :created
      rescue ActiveRecord::RecordNotUnique, ActiveRecord::RecordInvalid
        false
      end