How do I adjust the viewport as an action?

Is there an action that will adjust the viewport? I'm trying to change the size of the viewport when a character collides with a certain trigger, like a door.

I essentially need to zoom the camera into a specific room and lock it when the player touches a door.

I would normally use the System - Set layout scale action to zoom.

The viewport size can be changed by using the System - Set canvas size action. This is usually done to change the aspect ratio of the viewable area.