Skrbt -

The hatch lifted a quarter inch. A single, pale digit—too long, with a knuckle that bent sideways—curled around the edge.

It wasn't a screech. It wasn't a clang. It was skrbt —a short, dry, granular sound, like grinding peanut shells mixed with gravel and regret. The elevator jerked, stopped, and went dark.

Leo looked up.

The old elevator in the Meridian Exchange Building hadn’t been serviced since the Reagan administration. Everyone knew it. The super, a man named Lou who smelled of burnt coffee and resignation, had taped a handwritten sign over the call button: “OUT OF ORDER. USE STAIRS.” The hatch lifted a quarter inch

And the last thing Leo heard, before the dark took him completely, was that sound again, coming from inside his own skull now.

If the typo was phonetically based, you might have been thinking of:

He sat down in the corner, knees to his chest. The silence that followed the skrbt was heavier than the darkness. He started to count his breaths to stay calm. One… two… three… It wasn't a clang

At its core, to scrub means to clean something by rubbing it hard with a brush, sponge, or abrasive material. This action is distinct from simple wiping or washing because it involves friction and force.

It is most likely you intended to write one of the following words. Below are informative pieces on the most probable candidates.

The word "scrub" functions as a verb, a noun, and an adjective, with distinct meanings in domestic life, medicine, botany, and internet culture. Leo looked up

Leo’s first thought was cell phone . Dead. His second thought was panic button . He stabbed it. Nothing. He yelled. His voice didn't echo; it was swallowed by the thick, velvet-lined walls.

If you intended to write here is an informative overview of the term's various meanings.