Space is really big, as truly pointed out in many scifi movies, despite their other many other false claims about it. When the airlock is unsafely open or a hole is made in a spaceship, the air inside attempts to fill the void of space. If there is no walls to the container, like on a planet, it will only be stopped by gravity. Air, in fact, attempts to expand to fill the container it is placed in.
The air, as it has no pressure or enough gravity to keep it in the ship, will attempt to expand. You may be also be really unlucky and be pierced to death by a micrometeorite, but this is not likely.
You may need some hyperbaric oxygen treatment to lower any risk of "The Bends" - although your blood wouldn't boil violently, your blood may have micro-clots that divers for example have after an emergency free ascent in it. Given the size of the blow above, it's likely going to need to be a long lifeline, but, as explained by Phonon's answer to the physics SE question What exactly happens to an exposed human body in space? if you get back inside in a minute or two, you'll likely be OK. If you are uninjured by the blow, once in space you could be quite OK if someone could get you a lifeline in a few minutes. With its containing vessel suddenly open, air, from its thermal motion, suddenly becomes a rush outwards that's really going to whack you big time: rob does a calculation that shows that being shoved by this outrush is to suffer the same order of impulse as you would being hit by a car. User rob offers this answer to the Physics SE question Do airlocks in space decompress violently as they do in movies?. The problem is the violent outrush of air. The biggest, immediate problem with "openning the door" of a spacecraft is not that you would die immediately from exposure to the vacuum of space: you don't - you have of the order of minutes to do something about it.
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