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It is assumed that when Sephiroth attacked, he left the door open, allowing the unstable Cloud to continue to unknowingly serve him.

To dispute the above, in Crisis Core it's shown that Zack opens it after the door to his own is opened, presumably by Angeal (and later questionably proven to be Lazard under the influence of Angeal's cellular invasion).

^Wrong cell, Zack is dead, this is the one where Cloud and the others went into Shinra HQ to rescure Aeris (yes, I call her that when refering to the game events, for Crisis core, etc, I call her Aerith). Maybe the electrical units got jammed?

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