You really can't. I never secure my bases, and no monsters have come in. (Except that one purple creeper...)
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Spell? To open/lock a door in minecraft, it requires you to make a system of redstones that is connected to the door and a button, lever, or a pressure plate or if you want to lock it you make a sign that says [PRIVATE] when you click okay it will lock the door or doors if there are two doors next to another. Same with chests. If you are worried about people who grief on mutiplayer mode, then you can do the same as a door. You can lock it by placing a chest or chests ( two together ) by putting a sign above the chest saying [PRIVATE] hope this helped.[:
Right click on them
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Yes they can. Iron doors are very hard but not hard enough.....
Wooden doors can be placed normally, they are opened and closed by right clicking on them. Iron doors can only be opened or closed by buttons or levers adjacent to them.