you should consider an egress emergency door handle.... it is a one motion inter connecting door knob/handle... both the door knob and dead bolt turn at the same time...

it can be open from the inside, but not from the outside, without the use of a key. It is also heavy and hard for littles to open and close with out much needed effort... They are very expensive around $300-$450.00 for a good one, but it may be worth installing one to keep everyone safe and your business in good standing... I love mine...

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