Man hides in flat and dials 999 during robbery in Derbyshire
They got into the property on Bridge Street, Killamarsh, through an insecure door and demanded valuables from the shocked 38-year-old occupant.
He ran into another room to escape the men and forced the door closed while he called the police.
Police said the three robbers stole a television and fled.
The TV was later found abandoned nearby by police officers who responded to the 999 call for help.
All the men wore dark clothing and had their faces covered during the robbery at 10pm on Sunday.
Witnesses or anyone with information should call Derbyshire Police on 101 or Crimestoppers on 0800 555111.