Simple shelf puzzle?

[Potato]

So, my friend and I are working on a relatively short custom story, and we're experiencing some trouble with a certain puzzle that we're trying to set up.

Essentially, it's the interactive shelf from the main game propped up in front of a doorway. Simply enough, when the player locates it and tries to pull it open, it'll display a message saying something along the lines of "This shelf is a bit too heavy to pry open, it is definitely covering something though." So, the player won't be able to pull the door outward before manually taking individual objects off the shelf. When it's been emptied, it should be able to open with no hesitation.

What would be the most effective way to go about this and make it work?