Yes but did you made an NFC or an RFID? As much as i know, most phones have only partial(eg: only reading) or no support to RFID

And again, you’d need to know what the reader on the door want, you cannot just give it any random data and hope it works, i could accept only an encoded password in SHA-256 and you would not be able to do much really, there are probably ways to break thru but at that point is faster and easier to lockpick the door