hifi engine

Aiwa WX-220 Cassette Tape Deck Door Jam

The unit is 30 years old, and worked the last time I used it 10 years ago. Now neither deck door will open when I push the eject buttons. The doors seem jammed shut. I'm trying to repair it, but I don't remember if the eject function is purely mechanical, or if power is involved. Does anyone know? Thanks for any help.