Lock posts for defined roles

Hello !

I'd like to use this plugin with Gravity Forms. In fact, subscribers of my blog can submit their own posts in a "contribution" category which is not displayed on the homepage, and they can edit their posts. I want this plugin in order to lock certains posts, especially the posts that I display on my homepage, not only on the specific contribution category.

Is there a way to lock posts only for subscriber role for instance, in that way my authors can modify the locked posts but not simple subscribers ?

Thank you.