The Dutch word for key is
sleutel

Dutch Definition

sleutel	©
1. n-m. A key.
De sleutel van de auto - The key of the car
De sleutel tot geluk - The key to happiness
2. n-m. A wrench, a spanner.
3. n-m. (music) A clef.
4. v. first-person singular present indicative of sleutelen
5. v. imperative of sleutelen

toets	©
1. n-f. button, key (on a keyboard or other input device)
2. n-f. fingerboard (e.g. on a violin)
3. n-f. test, examination
4. v. first-person present indicative of toetsen
5. v. imperative of toetsen