Wouldn't it be easier to just keep illegals out instead of getting rid of them once they're already here?

I have a proposal to keep them out: We replace that old chain link fence with a 10 ft-tall brick wall. On our side we build an identical wall about 5-6 ft away so that it is hollow inside. We install trap doors on the top, above the hollow area. On the inside wall we have electrified wire running along the top so they can't just jump across the gap. Once they step foot on the trap doors they will either fall through or fall backwards from surprise. If they fall in they then have to follow signs on the wall (just an arrow pointing left or right) that will lead to an outpost. There will be an outpost every 5 miles manned by 2 people. Once they arrive to the outpost the door they go through will lead right into a cell (the door is part of the inner wall, their first step into the outpost is inside the cell). Then at the end of the day all of them that are caught are deported. This would create many jobs similar to constructing the free ways, sentry positions will (hopefully) be mostly volunteer, and it would make removing them easier. Also I forgot to mention the foundation of the wall would go 10 ft underground, hopefully discouraging them from digging under it.