Lost my job after 28 years

I was just beginning year 29 with my employer when I was terminated. I was warned a year ago that my boss did not like the way I was talking to his clients and was not happy with my work. I should have known he was not going to stop whining and complaining until I was gone. I did not ask for an example about client phone calls. I answered the phone with his name and took a message. If he was in his office I announced the call. I have worked for every person in the office without any problems. I was beginning 5 years without taking a sick day. I have filed for unemployment but this is an at will employer. Two issues for termination – violation of company policy and discharge for undisclosed reasons. I doubt that I will be able to collect unemployment. This is the first time I have ever applied for unemployment in my life. I have worked 48 years full time and was planning to retire in September. Good luck to anyone working for an at will employer.