Basically what this does is allow you to open an iron door from a separate location via dispenser shooting blocks onto pressure pad, and then allows you to use a double redstone signal to close the doors from the inside. When the lever is ticked DOWN it will always stay closed. To get out after the blocks disappear, you tick the lever UP, and press the button near the lever, activating the dispenser again. To close the door, simply collect the blocks and put them back into the dispenser. For you beginning redstoners, I don't suggest trying this. I've been playing Minecraft for well over a year, and saw this near the beginning of my playtime. When my sound drivers get fixed and I can record, I'll update the project with a tutorial video. NOTE: For those who want to try without the tutorial, the door must be deactivated by the lever with a redstone line into the block it's on, while the door must have a redstone torch to be closed, and the redstone from the pressure pad to the block it's on as well. That will deactivate the torch, opening the door. I also suggest two lines to the doors and a repeater for synced opening (It looks cooler) Good luck! Tutorial coming soon!