I bought a forclosed home and the Garage door opener didi not come with remotes. It's a Craftsman 1/2 horse. I bought 2 handheld remote openers and they work fine, but I think the original owners still have the remote (and I know they live around the corner) because my garage door opens in the middle of the night. Is there a way to change the openers "key" so their remote will not work?