I was recently hired as a manager. I was brought in to make changes and raise standards after they slipped during the worst of the pandemic. I am very experienced in this industry but it is my first management job. Previously I was only ever a supervisor.
The other members of staff have all been there for at least 5 years. They are all knowledgeable of this particular business (but not the industry in general) and hardworking and most of them are embracing my changes and are in agreement with them.
However, one person is very resistant and he is quite hostile towards me. He has made it clear he feels he deserved my job and does not agree with me being hired.
It's got to the point where when I (politely) ask him to do anything at all he openly laughs in my face and 95% of the time does not do what I asked. Or will only do it when I am watching and when I am not there goes back to the old way of doing it. Other staff then follow suit because this man was unofficially left in charge for so long, I guess.
I am always polite in my instructions. I have been clear in my reasons for making changes. The business owner is in agreement with me and is embracing my suggestions and ideas.
He also goes above my head and will do something without checking with me. For example, orders stock despite being told not to which leads to a huge surplus that we don't need and can't really afford right now, sends other members of staff home early despite their work not being finished, will perform other duties that should be left to me because he doesn't like the way I do it or he feels I do them too late in the day (ridiculous reason).
I just have no idea how to deal with this man. I've never worked with or had to manage someone so belligerent.
What should I do when he laughs in my face? How can I get him to stop undermining me? I'm on the verge of quitting because he is so unpleasant.
Maybe I'm not ready to be a manager.