This sound is from Many different ones SFX Library

The library was bustling with activity as people moved about, the sound of shuffling feet echoing off the walls. Suddenly, a loud knock pierced through the noise, causing heads to turn in the direction of the source. The sound was reminiscent of knocking on 1950s wooden farm doors, urgent and demanding attention. It disrupted the quiet hum of the library, bringing a sense of urgency that was palpable in the air.

As the sound reverberated through the building, it created a sense of anticipation among the library patrons. The rhythmic thumping of the knock seemed to build tension, leaving everyone on edge as they awaited the next move. It was as if the sound itself held a secret, waiting to be unlocked by those who were brave enough to investigate its origin.

Curiosity piqued, a few brave souls ventured towards the source of the knocking, drawn in by the mysterious sound. Their footsteps were muffled by the soft carpeting as they made their way through the aisles of books, their heartbeats quickening with each step. The urgency of the knocking only served to spur them on, driving them forward towards the unknown.

As they neared the source of the sound, the knocking grew louder and more insistent, filling their ears with its wooden resonance. The echoes of the past seemed to linger in the air, transporting them back to a time long gone. The sound of 1950s wooden farm doors being knocked upon urgently seemed to echo through the corridors, sending shivers down their spines.

Finally, they reached the spot where the sound was originating from, their eyes widening in surprise at what they found. A hidden alcove revealed a vintage radio playing old recordings of farm sounds, the knocking on wooden doors filling the space with its distinct timbre. It was a moment frozen in time, capturing the essence of a bygone era with its nostalgic sound.

In that moment, the patrons of the library were transported through time and space, enveloped in the sounds of the past. The knocking on 1950s wooden farm doors, urgent and insistent, served as a reminder of the rich history that lay within the walls of the library. It was a sound that resonated with them, stirring emotions long forgotten and sparking a desire to explore even further.

You can play and download these sounds here: [link]