I know the locks are controlled by vacuum but you should be able to unlock it from inside by pulling the door handle twice. However, something could have come undone in the latch mechanism but not likely. I have never heard of the security system keeping it from unlocking after it has been disarmed.
It's hard to say, hopefully someone else can chime in on this.
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01' S4 STG 3
01' SC'D A4
93' CHEVY P/U
08' HD NIGHTSTER 1200