
The RFID chips are meant to work as access cards. There's a reader outside the door; you walk up to the reader, put your arm under it, and it opens the door.

The technology predates World War II, but has appeared in numerous modern adaptations, such as tracking pets, vehicles and commercial goods at warehouses.
On privacy allegations that these RFID chips could enable companies to track employees' movements, Darks said - "It's a passive chip. It emits no signal whatsoever. It's the same thing as a keycard."
Source: VeriChip | US group implants electronic tags in workers | 2 workers have chips embedded into them