Those who participate all the time, those who keep their feet wet and those who don't while holding up a large closed sign with big locks on their door. (rismedia.com)
It is used to open up certain doors with big locks, and the boss door. (zeldadungeon.net)
Tony compared it to putting a «great big lock on your door» whereas you neighbors have left their windows wide open. (datingadvice.com)