Outraged that a convicted child rapist now works as an Upper West Side building super, a state assemblyman is proposing to ban high-risk sex offenders from such jobs.

“To have someone who has done such monstrous things to have the key to your apartment — it would strike fear in me,” Assemblyman Micah Kellner said.

Kellner (D-Manhattan) submitted his bill after learning that William Barnason, 57, was working as a superintendent and rent collector at three buildings despite being a registered Level 3 sex offender.

The Post yesterday exposed Barnason’s work at the buildings — and allegations by multiple women that he had sexually harassed and pressured them to have sex with him in exchange for rent breaks and other considerations.