user behavior – How to present locked sections that are clickable?

Don’t grey out the sections that are disabled. It is unclear that they are clickable. Make them white like the others, maybe with a slightly blurred overlay or a thick border in orange or yellow-black “under construction” colors. Something that makes them different from the others. Or maybe this isn’t even needed, that’s up to you to decide. But the grey background is not helpful and is even a bad choice contrast wise.

More important is that you add a button to the bottom with a single line description “You’ve not subscribed for this yet” and a label like “Subscribe” or “Want this? Contact us!”. The lock icon can be added next to the label in the button. But also place one in the upper right corner. That creates a connection between them and the button explains the meaning.

I can only give examples, the details are up to you.