Hello fellas. I got a lot of friends and they constantly forget to lock the doors when they get out of my car. I have to always check the doors after them, but I sometimes forget

. I have a 1994 Mazda 626 Cronos and I think it's a DX. I was wondering if it's possible to install power locks in my car. Nothing too fancy like with remote control, just standard locks that shut all doors when the drivers door is locked. Anyone know if this is possible?
Thanks a bunch,
Jaina