I’m trying to log into my old apple account into my new iPhone haven’t had one in three years and now it’s saying for security reasons my account is locked and trying to send a code to an old number I had... what do I do

If you are locked out of your Apple ID account you can go to https://iforgot.apple.com

This will provide you with the recovery steps you put in place for this situation.

Here are some support articles that should help:

If you forgot your Apple ID password - Apple Support

If you forgot the answers to your Apple ID security questions - Apple Support

If your Apple ID has been locked or disabled – Apple Support

If you have 2 Factor Authentication enabled, see if anything here helps.  If necessary, you can use account recovery as explained in the link at bottom of the article.

Verification code - how to get one and sign in with two-factor authentication.   

See this document If your Apple ID is locked or disabled https://support.apple.com/en-us/HT204106 "If you or someone else enters your password, security questions, or other account information incorrectly too many times, your Apple ID automatically locks to protect your security and you can't sign in to any Apple services.

If you use two-factor authentication, you need a trusted device or trusted phone number to reset your Apple ID password and unlock your account. If you have a recovery key, you can also use it to help you regain access to your account. …

If you use security questions with your Apple ID, or if you don't have access to a trusted device or phone number, go to iforgot.apple.com. Then you can unlock your account with your existing password or reset your password. After multiple unsuccessful attempts to unlock your account, your Apple ID will remain locked and you can try again the next day.” Eventually you very likely will end up in account recovery.

Apple support might be able to help you if you have your receipt for the purchase of your device from an authorized Apple seller with its serial number on it. See the support options below. Alternatively, if an Apple Store is open in your area, then you can go there to deal with your problem. In this case, you can make a genius-bar appointment (https://www.apple.com/retail/geniusbar/) if you want.

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option.

Apple Support Twitter https://twitter.com/AppleSupport 

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169