A bumbling bike thief made easy work for cops early Tuesday, when he walked into their station 20 minutes after the theft asking if anyone had seen his lost cell phone.

Port Authority police in Jersey City responded to a call that someone was clipping bicycles from a bike rack on the Plaza level of the Journal Square PATH station at about 2:30 a.m., according to Authority officials.

There police say they found Alamin Abrams, 37, using bolt cutters to snip the chain on a Mongoose brand bike. Cops collared him, but suspected he had an accomplice who had already stolen a ride and pedaled off, so they checked security footage and got a look at second suspect Travis Murphy as he allegedly swiped a $200 Diamondback brand bicycle.

And they didn’t have to look very hard for Murphy — 20 minutes later, he strolled into the PATH police desk, which is about 30 yards from the bike rack he burglarized, asking about his lost cell phone.

Cops recognized Murphy and slapped the silver bracelets on him too, charging him and pal Abrams with theft and possession of burglar’s tools.

“Call it Murphy’s Law,” Port Authority spokesman Joe Pentangelo joked to The Post, referring to the old adage that “anything that can go wrong, will go wrong.”