At the Ovolo in Hong Kong I must have mis-entered by one digit from my normal code and couldn't get it open and like others reported a man that seemed to be maintenance came up with a large device to open it. I also had to show him that the room key I had opened the hotel room door.

At The Table Bay Hotel (V&A - Cape Town) I came back and it kept getting and error when trying to open. I called the front desk and 5 min later a man from security came and he said I had left the safe open the maids saw that and their procedure is to leave the room and call security. Security then comes in and locks it. He opened it for me and asked me to inspect that all was in order (which it was).