There is a reloading bench inside near the door. The shop's inventory is displayed on the shelves around the store. A desk sits in the back right corner, where Miguel usually stands next to. Miguel's inventory never refreshes and the items on the shelves are part of his inventory.
Miguel's Pawn Shop appears only in Fallout: New Vegas.
When trying to enter, the prompt to do so may not appear on the door. This can be fixed by entering third-person view and looking at where the overhang and door meet. [verified]