LTS -

Put an electric garage door opener on one of your entry doors. For a very few bucks you can get a "keypad" that allows you to program in a "PIN" number, usually 4-digits, that will open the garage door for you and turn on the light. You can program changes to the PIN number yourself, usually just by popping out the backup battery to clear the memory and punching in a new number.

Alternatively, the opener will come with "remote" openers so that you can open the door (and turn on the lights) before you leave your vehicle, and new openers can be "coded" (by you) quite simply, or a lost remote can be "cleared" so it will no longer work.

Of course, if you have to build a garage to have a place to put the opener it might get a little more expensive, but ....

John