Application that allows for a QR code or passkey to be generated to open doors

Pretty much as it says on the tin.

Anyone heard of an app or function my business can use to give a user access to open a door for 1 hour. Either with a pass key or QR code? Then discard the key and allow another user to access for the next hour?

Any ideas etc much appreciated.

Thank you reddditers

submitted by /u/letsgetthehype
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