You certainly can steal, threaten the staff, or set the place on fire. To the extent that shop and its people are recognized and protected by laws and government agencies such as the police, you'll likely face serious repercussions. But say the shop is liquidated in Chapter 7 proceedings by Bankruptcy Court, appeals exhausted, ownership of all assets transferred, the building condemned. The shop no longer exists, and in fact may be lawfully demolished.
You could setup a table in the middle of a busy intersection, put some items on it, and declare it to be a shop. That does't make it a shop (or for that matter yours).
What is "ownership" absent law? Is it something you can measure, like gravity, velocity, field strength, pH or temperature? Without the law, a manifestation of government, ownership is simply a belief (which is the antecedent of the law).