The other day when I was in Los Gatos for work, I stayed in a nice hotel that had electronic locks on all the rooms with what looked like no manual bypass. I went back to my room one of the days I was there and my key didn’t work. I went to the front desk and asked to get a new key; the system wasn’t working to generate a new key, so I had to be let in the room by the front desk clerk. He used an electronic master key. What would have happened if the master key didn’t work? Would all the rooms unlock (I’d hope not)? How would people get in? Later when I went to get a new key, the system was working again, but I wonder how my card key got deactivated. Hmmm.