My husband died and I am not actually looking for anyone but I can see how lock down alone would get you to thinking that.
I have met men and been asked out a fair few times and its always been normal and natural and out of the blue. These are the way I seem to get men talking to me.
Volunteer, like you I work full time but I do a few volunteering roles in areas that I care about. I help clean up at a local park and do a bit of gardening I am into the environment and nature there are a lot of like-minded older men in these roles.
Once a month I volunteer at my local unban farm there are no end of friendly people coming and going, visitors , people buying eggs and such they become friends.
I also do volunteer in other caring roles and again there are always older men in these roles.
I do it to ease my anxiety and my grieve but I have met a lot of friends men included. ( I work in education so I do get free time in half terms and stuff but most people can give an hour a week )
Get a dog when My husband was dying and I was out walking the dog I was amazed at the amount of people that stopped and chatted not just men but it is a way to make friends. Sadly the dog died but I work too many hours now but animals are always to open a conversation.
Google local community groups in your area.
Be friendly and smile I find men quite often just chat to me and I have been asked out a few times because I probably look friendly and approachable. Also I am not always looking at a mobile phone, ditch the mobile when you are out so you can interact more.
Join a keep fit class for older people loads of older men
join these now, espeically dancing classes and water arerobics .
Join a book club my friend met her lovely husband this way.
Personally, I would look for friendship first and see what grows from there. As I said I am not looking for love and I get asked out a lot more than my friends who are, so I think there is a clue in there somewhere dont look, let it find you.
Of course it goes without saying you can only do these most of these things when lock down is over. Keep safe.