Build this simple keypad operated electronic door release yourself - using cheap off-the-shelf components.
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Electronic Door Release - Photograph

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Door Release
Schematic
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Circuit Board

This is a photograph of the Keypad Operated Electronic Door Release. Enter the four-digit code of your choice - and the relay will energize for a preset period of time. Use the relay contacts to power the release mechanism. I used an SPCO/SPDT relay in the prototype - but you can use a multi-pole relay if it suits your application.

A Photograph Of Ron J's Electronic 
Door Release - Circuit Board


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Door Release
Schematic
The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International