Have you looked into anger management resources?

Lots of people have trouble w/losing their cool occasionally, but slamming a steel door with your fist makes me think that this isn't your first time. My brother used to do the same thing with telephone poles, often scaring the person he was with a lot. For my brother, his bad temper made his gf's physically and emotionally afraid of him, which gave him more power in the relationship.

I don't know if my description of my brother sounds familiar to you, but if anyone saw you hit the steel door at work you're certainly making people wonder just how safe you are to be around. Hopefully, no one saw you & you can get into a group to help you manage your anger in a healthy way.

Best wishes to you!