The entire incident was caught on surveillance video, which authorities are hoping will lead to an arrest.
It happened around 2:30 a.m. At ATN Financial Services on Corona Avenue in Elmhurst.
Police say the suspect squirted lighter fluid throughout the location, displayed a lighter and demanded cash.
The employee complied, and the suspect fled with cash.
No injuries were reported.
Anyone with information in regards to this incident is asked to call Crime stoppers at 1-800-577-TIPS (8477).