Shortcode in Widget

Hi guys.

I want to set Content Locker plugin in my widget since I have a most important thing in there. But sadly the plugin just allows the Shortcode to call it and we know default wp doesnt support shortcode in theme or in html form.

The shortcode uses opening and closing form like [locker id="123"]most important thing[/locker].
I have searched in google but many results give a guide for opening form only. I also get one answer about opening and closing form but it didnt explain about…

Shortcode in Widget