DOCBatch has Siri Shortcuts (in beta). On iOS 13+ devices, ask Siri to make a reservation at your preferred dining location, add to your homescreen for one-click reservations, and make reservations on your Apple Watch!
Before getting started, enable Untrusted Shortcuts in settings (Settings -> Shortcuts -> Allow Untrusted Shortcuts). Then, add the shortcuts for your preferred dining location.
When you add the shortcuts, you'll be prompted to add your User ID. Retrieve this by using the What's my User ID option in the menu. Once that's done, enjoy even quicker reservations!
Add Shortcut for CC (v1.1.1)
Note: Right now, these shortcuts don't check if a location is closed, and won't apply the logic to not make a reservation for the closing time of a location. This will be enabled in a future server-side update.