Can someone get into our office network through a free wall socket?

Yes, if the socket is patched to a live switch port. A visitor, a contractor or an intruder can plug in a laptop, or leave a small computer such as a Raspberry Pi behind a printer, and it then sits inside your firewall. Prevention is cheap: disconnect switch ports that are not in use, use 802.1X or at least port security so that only known devices get access, put meeting rooms and reception on a guest network, and look behind printers and under desks during walk-throughs. Detection is the second layer. The NetSenX network map, on every plan, shows new devices that start talking on monitored segments, and NetSenX flags a hidden device that calls out at regular intervals as beaconing. If the device reaches the attacker over its own mobile connection, only what it does inside your network is visible, such as scanning; a device that only listens stays invisible.

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