Quick question about template sensor

@mefistofelis wrote:

If I enter the following in developers tools template i get the minutes that have passed since the door was closed. When I use it as a template sensor i get 0.

This works:
{{ ((as_timestamp(now())-as_timestamp(states.binary_sensor.sensor.last_changed))/60) | round | int }}

This doesnt:

- platform: template
  sensors:
    door_closed_since:
      entity_id: binary_sensor.sensor
      value_template: "{{ ((as_timestamp(now())-as_timestamp(states.binary_sensor.sensor.last_changed))/60) | round | int }}"
      friendly_name: "Time since Door was closed"

Any help?

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