See pic.

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FYI, remove the T-handle or rope from the manual opening device.
Too easy to shove a wire over top off garage door, snag the t-handle / rope to open manually.

Situation is much worse than you think. Garage door codes are easy to hack. Say your door and opener are a decade old.

https://www.wired.com/2015/08/hackers-tiny-device-unlocks-cars-opens-garages/

Wired magazine says that RollJam can spoof the receiver that reads the code coming out of the remote. This defeats the earlier rolling code systems. If your receiver uses only one fixed code, then a sniffer will catch it when you or your wife open or close the garage door with the remote. Too many contractors and salesmen in your neighborhood will increase your chances of being robbed. The temptation to case a joint or trade information is too great. Even in my area, a shipment of windows was stolen in broad daylight.

It is far easier for a thief to use a passive entry device on a door away from the front of the house. SEARAT is one such tool. Most locks can also be picked easily using tools you procure from Canada. The Lock Picking Lawyer has a youtube channel explaining how to pick standard and high-end locks.  It is not illegal to own lock picking tools in Hawaii, but it is to use them to gain unauthorized entry to a place.

Just adopt a dog who does not sleep all day. Or, put in a good alarm system in your home.

One of the easiest ways to get the garage door to open is wait for the resident to leave.  Have a remote control toy truck -- something close to a foot tall +/- -- and drive it into the garage before the door closes.  The truck will trip the safety sensor and make the door reverse direction.  All newer garage door openers require such a safety sensor so kids, pets and even slow adults don't get injured by the door.

The downfall with newer openers from the thieve's perspective is many come with or can have an optional WiFi module installed.  Mine tells me on a phone app when the door opens, closes, has stayed open for 5 minutes after opening (great if someone forgets to close it), re-opens because the sensor was tripped, and so on.

That works when the opener is engaged.  If someone uses the manual pull rope, the opener won't report a thing.

Of course, that's what the WiFi camera in the garage is for.   

If you can't manage a remote control toy, you can also try rolling a ball to trip the sensor, but then you may be visible trying to get close enough to beat the door coming down.