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I have an office door I need to keep locked but allow easy access. It doesn't have to be super secure, it has a proper deadlock for when we are closed, it just has to stop people casually walking in.
But everyone having to remember to lock it behind them with the key+deadlock is slow and inconvenient.

Any suggestions on a simple retrofit electronic lock? Low cost and easy to fit are priorities.

All the ones we looked at are built for Fort Knox. We just need something that moves a plunger out of the way for a few seconds with something like a garage door opener?

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define 'low cost'. Something like this is going to be in the $100-200 range. There are radio controlled ones (although, check the features, many are deadbolts that you'd have to re-lock, defeating the purpose), and Schlage has a line that can be opened from anywhere via an iPhone app. –  Joe Oct 24 '11 at 17:40

2 Answers 2

up vote 3 down vote accepted

You don't necessarily need an electronic lock - you just need a lock that is always locked from the outside and yet allows exit from the inside. Something commercial in nature is probably in order. You probably won't find this at a home supply store, however. You likely will need to consult a locksmith.

CORRECTION

Link to Home Depot collection of storeroom locks.

You can find them at Home Depot.

Thanks to RSMoser for the proper name!

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This type of lock is refered to as a "storeroom lockset". These locks operate the door with a key from the outside, and allow easy egress from the inside. They cannot be set to an un-locked position… they are always locked. Here is a link to the schlage website with the different types of locks and functions. professional.schlage.com/application_solutions/… –  RSMoser Oct 24 '11 at 17:29
    
Electronic was so we didn't have to manage keys for everyone. But just a latch type lock is probably going to be easiest –  mgb Oct 24 '11 at 17:35
    
Ah well in that case Home Depot sells those for $100ish too. –  The Evil Greebo Oct 24 '11 at 17:36

For a more high tech solution, have a look at Lockitron.

enter image description here

It fits over your existing deadbolt, and allows you to use your phone as the key. It allows you to grant and revoke access as needed, and also lets you lock/unlock the door remotely.

I've never used this product, nor am I associated with it in any way. I just think it's cool.

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