Seeing a door and a key in a dream indicates that your happiness will increase, your body and soul will heal, you will gain great wealth by making great profits and you will marry a very lucky person, the help given will return as a blessing, you will enter a period full of problems and discussions, your financial troubles will exceed your limits, if you are unemployed, you will have a job with good conditions.
Also, seeing a door and a key in a dream indicates that you will come to a very good position, the problems will be solved in a short time, you will suffer great troubles because of this person, you will experience worse days, your efforts will be in vain, you will be very sad.
Psychologically, seeing a door and a key in a dream indicates that the partnerships established will open new doors, my ex-lover's new lover is sitting next to the house we moved into. Then I am checking their house from outside, it indicates that a short journey will be prolonged more than necessary due to the misfortunes to be experienced, their joy will be restored, they will become quite famous in a short time, their troubles will end and happy and good news will be received, they will act in a planned and programmed manner, they will help.