A key card was an object to open an electronic lock.[source needed]
After being caught by the Deputy Chief Caretaker, the Seventh Doctor was able to trick him so he could escape. As he left, he took the Deputy's key card. (TV: Paradise Towers)
The Eleventh Doctor used Gol Clutha's key card to explore the ship. (COMIC: Hunters of the Burning Stone)
Bernice Summerfield stole Bernard Moskof's key card, copied it, then carefully put it back in his pocket. (PROSE: Drinking with the Enemy)
Darius Pike stole a key card from prison governor Thorne and gave it to Jorjie Turner. (TV: Liberation)