The door access could be controlled by a standard electric strike. http://www.adamsrite.com/media/pdf/es7140.pdf
Note the power supply options for this are 12, 16, or 24 volts, AC or DC. You get the power supply from AdamsRite, then all you have to do on your end is provide a single pole switching function to activate the strike. Once you have decoded the voice in your system, one of your elec.engr. buddies can easily give you a power swiching circuit.