Jocelyn isn't Rosa. She's not patient or methodical, and she doesn't particularly care about other people's property, as you can tell from her comment about looting this abandoned store.
Hint 2
In other words, don't bother looking for a key. The left window is broken and boarded up, and so is the door. The right window isn't broken. Yet.
Hint 3
See the loose brick on the ground? Pick it up and use it on the window.