Thieves stole a car after taking the keys from its owner's home in Gleadless.
Police said the 'two-in-one' burglary happened in Arnold Avenue yesterday.
The car, a Toyota Rav4, was stolen along with other items including jewellery with a value of about £3,000.
Posting on Facebook, the Sheffield south east policing team said: "Can we please ask from a crime reduction point of view that vehicle keys are not left on display in your property when you are not at home.
"Also when in your property make sure you have sight of your car keys, don't leave them on a kitchen table with an insecure outer door, and you be in another room.
"Someone will seize this opportunity. If you leave your property and are not taking your vehicle, either take your keys with you or find a secure place within your property."
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