2004 Dodge Neon (I owned one as well, so I know firsthand). Note the small pull tab on the part of the seat in the 'up' position. There was no provision for a locking mechanism that would prevent entry via the passenger compartment.
I've rented other little econoboxes in the past and noted the same thing - tumble-down rear seats needing only a tug to release them from the passenger compartment and no provision for a trunk-side lock of any sort.
My old Acura was the same way. That is the reason advised caution if the rear seats can fold down. There appears to be no standard 'locking' mechanism restricting passenger compartment access, as it likely varies by make and model.

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