Wordsmiths:

[vela]

I need a short, (catchy) phrase having to do with KEYS.  (The kind you open a lock with)

...Something that can go in a greeting card, but is not too Hallmark-y.
Doesn't even have to rhyme.

[Endeavour Cull]

Your keys or mine
Your lock is the key
A key is a key
Keys are the key
Don't let me key-less
To key or not to key
Happy key day
Key me!
Let's key together
No key-ing please
The door is always open - no key needed
Give me your key
Get that mon-key of my back
Who cuts the tur-key
I am your key
If the box opens you used the right key
Let me key
K.I.P. (Keys in peace)
Happy Hallow-key
I like your keys
Never give your key away
Key safe!
Always use keys
Trick or key
Keys- don't leave home without them
The best things in live are keys
Only a key unlocks my heart
Finding the right key is never a waste of time
If you want to key, do it with me
Happiness is only a key away


Please send 10% of your profits to my bank account 

[Seaton Begg]

Action is the foundational key to all success. - Pablo Picasso

I don't know the key to success, but the key to failure is trying to please everybody. - Bill Cosby

[pakled]

I remember (I think) Asimov having a story with a tri-lingual pun on Clavius (key). Wish I could remember where...

[MWBailey]

"Turn my key, Love"