A device, method and computer program product enable an automatic locking/unlocking of a user device such as a computer workstation or laptop based on accurate location and authentication of wearable device. A device interface of the device couples to a second device that has a locked state configurable to an unlocked state by the device. The device receives, via an antenna assembly and an UWB transceiver, UWB signals from a third device, the antenna assembly comprising two or more antennas spaced in a support structure as one of a two-dimensional (2D) or a three-dimensional (3D) antenna array. The device determines a location of the third device based on a range and an angle of arrival of the received UWB signals. In response to determining that the location is within an unlock space of the second device, the device communicates an unlock command to the second device.