choose random host frm the playbook to delegate to

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Hi,
I need to run jib on one host from the hosts in playbook. To distribute
it, should be random host. But as many time as I run the playbook,
always the first host is chosen. Please, what do I wrong? Right now ,
there are only two hosts in the list. See sample playbook.

ansible 2.2.1.0

- hosts: jobs
  vars:
    lock_file: /tmp/test.lock

  pre_tasks:
  - name: "create lock file"
    file:
      path: "{{ lock_file }}"
      mode: 0600
      owner: root
      group: root
      state: touch

  tasks:
  - set_fact:
      job_host: "{{ ansible_play_batch|random }}"
    run_once: True
    delegate_to: '127.0.0.1'

  - name: "do action on one host"
    file:
      path: "{{ lock_file }}.xxx"
      mode: 0600
      owner: root
      group: root
      state: touch
    run_once: True
    delegate_to: "{{ job_host }}"

  post_tasks:
  - name: "remove lock file"
    file:
      path: "{{ lock_file }}"
      state: absent

  thanks
    Peter