Help with RFID code

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hello new arduino. have arduino uno. have rfid sketch running on unlock door turn on overhead light. working great add , cannot seem working pushbutton on analog input 0 when pushed activate unlock portion of code reading valid card set digital pin 7 high delay 500 ms set pin 7 low again. cannot work. attached working code without of pushbutton code.
any on great. thank you

have @ nick gammon's switch tutorial (http://gammon.com.au/switches), write code, , if have problems, come , post code.


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