[He's focusing hard on the lock, feeling for each tiny click and waiting for the slightly bigger one that'd indicate a correct number. Given that and the complete lack of sound, it's really not hard to sneak up on him at all.
So there's suddenly a person's face right there, and as he startles badly his immediate reaction is distance and self-defense. Kokichi lurches away, swinging a fist instinctively at the body that's all up in his personal bubble. But he at least has the space of mind to manage a deft little sleight of hand that slides a small jeweler's screwdriver from his sleeve into his hand.]
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So there's suddenly a person's face right there, and as he startles badly his immediate reaction is distance and self-defense. Kokichi lurches away, swinging a fist instinctively at the body that's all up in his personal bubble. But he at least has the space of mind to manage a deft little sleight of hand that slides a small jeweler's screwdriver from his sleeve into his hand.]