A key designed to stay visible
Before plastic key cards became common, a hotel room key was a small piece of metal that could disappear easily into a pocket or bag. Attaching it to an oversized, heavy fob changed how it felt to carry: the key was conspicuous and awkward, rather than something a guest might forget was still in their pocket.
That bulk also made the key easier for staff to recognize and sort at the desk. The fob could identify the key at a glance, while its size made handing it back part of the routine of leaving the hotel.
A small safeguard, not a lock
The design worked by shaping guest behavior, not by making the lock itself more secure. A large fob could not stop someone from taking a key, but it made doing so less convenient and forgetting it less likely. That mattered because a missing physical key could leave the hotel with a practical security problem: someone else might still have access to that room.
The block turned an easy-to-pocket object into something that invited a return to the front desk—a simple piece of hotel hardware doing the work of a reminder.
