 Don't you press every day that don't do what you think. These were deactivated in the 90s when the ADA stipulated that elevators had to be open long enough for everyone to get in. Many office and hotel room thermostats can't go outside a set range, or are not even connected at all. The vast majority of these were disabled when computer-controlled traffic became the norm. That said, you might be waiting quite a while if you get the very rare one that still works.