Is it considered a religiously forbidden act and a sin to prevent workers from closing the shop and all going to the mosque for prayer, and what is the solution to prevent customers from missing out, especially with the workers threatening to resign?

A person is excused from attending the congregational prayer if they are at a distance from the mosque where they cannot hear the call to prayer with a normal voice without a loudspeaker, or if they are an employee whose departure would harm their work. In this case, they may pray with a congregation in their locality if one is available.