A Florida high school janitor who admitted recording students in a girls’ locker room has been sentenced to 20 years in federal prison.

Jason Brian Goff, a former custodian at Clay High School in Green Cove Springs, pleaded guilty in September after two 14-year-old students found a cellphone taped to the inside wall of a gym locker with its camera lens aiming out of a prefabricated hole, the US Attorney’s Office for the Middle District of Florida said Monday.

Goff, 45, who pleaded guilty to attempted production of child pornography, was also ordered to register as a sex offender and serve 10 years of supervised release. He was arrested in September 2019 and has been detained since that time, federal authorities said.

An analysis of Goff’s phone uncovered a 30-minute video that was filmed from a window into the girls’ locker room, where several female students were recorded changing clothes.

The footage also briefly showed Goff’s school identification badge, federal prosecutors said.

Goff, of Starke, admitted that he tried filming girls in the locker room on at least three occasions from varying vantage points, court documents show.

Investigators also found additional images from the locker room on Goff’s other electronic devices, as well as a trove of child pornography containing video and images of adults sexually abusing children, some as young as infants, prosecutors said.

Goff was sentenced last week in Jacksonville, according to court records.

“It is beyond reprehensible that this predator used his position of trust as a school employee to sexually exploit children,” Homeland Security Investigations Jacksonville Assistant Special Agent in Charge K. Jim Phillips said.

With Post wires