A former NYPD detective sobbed in court Monday as he begged a judge to show him mercy for lying while under oath — but was still slapped with three months behind bars.

“I cut corners and I was lazy,” wept disgraced ex-Detective Michael Foder, who admitted to lying on the stand during a pre-trial hearing in a robbery case, and backdating documents. “I took the easy way out. And look where it got me.”

He also apologized to prosecutors for ruining their case, as the charges were later dropped because Foder had tainted the investigation by claiming to have shown the victim photo arrays at an earlier date than he actually did.

The 42-year-old had faced up to five years behind bars following his August 2018 guilty plea to charges of perjury. He resigned from the NYPD that same month.

While Foder’s attorney, James Moschella, said his client had been in over his head, prosecutor Nathan Reilly Monday blasted the excuse from the 10-year-veteran of the force.

“You don’t forge documents. When you come to court, you tell the truth,” Reilly said. “There’s not anything about that that requires a great deal of training.”

Brooklyn federal court Judge Pamela Chen agreed and called his crimes “blatant.”

“Surely he knew better than to falsify documents,” she said. “He was too experienced an officer to ever think for a moment that [this was OK].”

“There should be a punishment beyond simply losing his job,” Chen said after sentencing him to prison, adding that Foder had “violated his most basic duty as an officer.”

Foder has up to 60 days to surrender to the Bureau of Prisons.

Though he has yet to be assigned a facility, the judge said he could request to to swap prisons if he’s assigned to the Metropolitan Detention Center.

The MDC is under fire after it was revealed that inmates were left without heat or electricity last month, during some of the coldest temperatures of the season.

The facility has since been slapped with lawsuits from the Federal Defender services and a class action by inmates.