Hours may fluctuate
The hours are correctly listed on the IRS.gov website under contact your local office. The person working there was by himself and if there is an issue in the office or outside the office he is forced to shutdown. Now that there is a new person it happens less frequently.
Since the funding was cut and they lost people I am sure it was difficult for them. Last year I know they were down to one person servicing a large region. But in February I know they had a second person and their hours were correctly posted in the website and on their door. Since I have to go in there all the time I know you are very mistaken.
set hours posted on the website would be nice. .instead of guessing when they might be open