It's almost impossible, if you live in the country and do country type things like gardening and yard work and bringing in firewood and sitting on the wharf, screen door or not, to keep a cat in the house at all times. They want to be out, with you or without you, and will be waiting for the chance all the time. Far better, IMO, to train the cat to come when you call, to make sure it gets used to being outdoors and learns that there are dangers (one good wetting keeps cats from jumping off wharves, for instance; and being scared up a tree by an ATV is a good learning experience about engine noises). And make sure they are indoors for the night, when it is far easier to keep 'em there.

One of my neighbours has an expensive purebred indoor cat, and in spite of heroic efforts, that cat has gotten out dozens of times, whether it's someone coming in the door with arms full of groceries, Jehovah's insisting on handing you literature, or the phone repair man going in and out as he fetches tools and tests lines. And once out, that cat has not a clue, doesn't come when called, gets frightened and runs further away, and endangers itself through kitty-ignorance.

I've had indoor city cats and outdoor country cats, and the oldest was an outdoor kitty of 18 wise years.

My present cat is eight months old. I let him in and out during the day. He comes when called, and I make a fuss of him when he comes. In the evening, I go out and call him, then I play with him outside for a while, so he knows there's playing waiting at that time. Then I pick him up, snuggle him and carry a happy kitty in to his supper. So far that works very well.