Long running process in Blazor Server

public class TestService
{
    public void StartLongRunningJob()
    {
        LongRunningJob();
    }

    private async Task LongRunningJob()
    {
        while (true)
        {
            Thread.Sleep(5000); //Simulation of something that locks UI thread
            await Task.Delay(1);
        }
    }
}

@inject TestService TestService

<button class="btn btn-primary" @onclick="HandleButtonClick">Start Long Running Job</button>

@code{
    private void HandleButtonClick()
    {
        TestService.StartLongRunningJob();
    }
}