In my bedroom, I have a bedside safe with 4 push buttons that can be programmed for whatever order (combination) the owner desires; when the combination is entered the door springs up (open) allowing access to the safe, this only takes a couple of seconds and doesn't require any light.
I don't know if anything like that bedside safe design is available for under seat.
I have the Besttop underseat lockbox in my Wrangler. I keep the key to it on a quick release type keychain. When I'm riding in the jeep, I remove the key from my keychain and insert into lock but only turn about 1/2 way. At only 1/2 turn the box remains closed, the key stays in, and I only need to reach down and make a partial key turn to open the box.
2010 Jeep Wrangler Unlimited
Oil changes at 6,000 miles? No way! My goal is for the motor to last as long as possible, not the oil.