Voice Activation!

I have a Keyless touchpad door lock on my front door...

I was wondering if there are any small devices available that i could record a voice command and when i say the command it sends out a dc signal for a short amount of time.

If so i could connect the dc output to the motor in my door lock and i wouldnt even have to touch the door i could just tell it to open with the command.

The motor uses 9volts and how the device currently works is you press a 4 digit password on the keypad and the electronics inside send a short dc voltage long enough to retract the dead bolt.

Any ideas of how i can do this?

There are development kits out there , but they aint cheap and , I do recall dimly that the old ZX-81 could manage it ,just!, sadly have no idea where you could go to to find / download the program.