Blueguard Self-opening Doors

Even before the recent Star Trek reboot, we were always fascinated by the technology from that science fiction franchise. It wasn’t just the warp drives, food synthesizers, and transporters, but something all too simple: self-opening doors.
Yes, for some reason, the United Federation of Planets outlawed the doorknob sometime before the 23rd century, and all doors must open with an odd swish sound effect, provided the user is in close proximity.
This is very similar to the Blueguard, which is able to open your garage door when you get 33 feet of it. It uses Bluetooth wireless technology on your cellular phone to detect when you are close. It has the capacity to obtain a signal from 10 cellular phones.